OBJ Reader - Revision history

Matt: Minor edit to embolden 'Filename' in the descriptions of Sequence First and Sequence Last

2025-11-02T21:58:00Z

Minor edit to embolden 'Filename' in the descriptions of Sequence First and Sequence Last

Matt: Minor correction to my previous edit of Sequence first/last parameters

2025-11-02T21:52:29Z

Minor correction to my previous edit of Sequence first/last parameters

Matt: Updated explanations of Sequence parameters, and added mention of C-style format strings for the filename parameter.

2025-11-02T21:47:29Z

Updated explanations of Sequence parameters, and added mention of C-style format strings for the filename parameter.

Redmaw: Updated example images and page layout per meeting notes.

2020-08-27T23:40:58Z

Updated example images and page layout per meeting notes.

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Redmaw: Modified Mesh Modifiers and Recalc Normals description and examples.

2020-08-17T20:25:21Z

Modified Mesh Modifiers and Recalc Normals description and examples.

Redmaw: Added descriptions & examples for Recompute Normal, MDD Reverse Z axis. Updated example images to fix render artifacts.

2020-08-15T19:41:29Z

Added descriptions & examples for Recompute Normal, MDD Reverse Z axis. Updated example images to fix render artifacts.

Redmaw: Adjusted formatting and layout. Updated descriptions.

2020-08-08T01:29:55Z

Adjusted formatting and layout. Updated descriptions.

Redmaw: Put images into tables for side by side comparisons. Still need desc for a couple of items.

2020-08-08T00:17:49Z

Put images into tables for side by side comparisons. Still need desc for a couple of items.

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Redmaw: Updating document to include current feature parameters. Update currently in progress.

2020-08-07T23:33:32Z

Updating document to include current feature parameters. Update currently in progress.

Show changes

Redmaw: Updating document to include current feature parameters. Update currently in progress.

2020-08-07T22:08:21Z

Updating document to include current feature parameters. Update currently in progress.

@@ Line 35: / Line 35: @@
 [[File:OBJReader_04_SequenceTab.png|none|460px|Sequence Tab]]
 '''Settings:'''
-<ul><li>'''Sequence first:''' When a supported frame insertion pattern is used in the filename parameter to load a file sequence, '''Sequence first''' and '''Sequence last''' control the range of numbers that are allowed in the file sequence. For example, if you have files with names MyObject_0001.obj to MyObject_0010.obj and want your animation to use them all, you would set '''Sequence first''' and '''Sequence last''' to 1 and 10 respectively.</li>
+<ul><li>'''Sequence first:''' When a supported frame insertion pattern is used in '''Filename''' to load a file sequence, '''Sequence first''' and '''Sequence last''' control the range of numbers that are allowed in the file sequence. For example, if you have files with names MyObject_0001.obj to MyObject_0010.obj and want your animation to use them all, you would set '''Sequence first''' and '''Sequence last''' to 1 and 10 respectively.</li>
-<li><li>'''Sequence last:''' When a supported frame insertion pattern is used in the filename parameter to load a file sequence, '''Sequence first''' and '''Sequence last''' control the range of numbers that are allowed in the file sequence. For example, if you have files with names MyObject_0001.obj to MyObject_0010.obj and want your animation to use them all, you would set '''Sequence first''' and '''Sequence last''' to 1 and 10 respectively.</li>
+<li><li>'''Sequence last:''' When a supported frame insertion pattern is used in '''Filename''' to load a file sequence, '''Sequence first''' and '''Sequence last''' control the range of numbers that are allowed in the file sequence. For example, if you have files with names MyObject_0001.obj to MyObject_0010.obj and want your animation to use them all, you would set '''Sequence first''' and '''Sequence last''' to 1 and 10 respectively.</li>
 <li>'''Frame offset:''' This value provides a way to load files with sequential numbers that are different from the rendered frame numbers, to shift the timing of the animation or to account for differences in how the frames are numbered in the object filenames. Terragen adds '''Frame offset''' to the project's current frame number to determine which file number to load (with the actual file number being limited to the range defined by '''Sequence first''' and '''Sequence last''' with optional looping or ping-ponging). For example, if the '''Sequence first''' value is "1", the '''Sequence last''' value is "10", and the '''Offset''' value is "4", then MyObject_0005.obj would be loaded on frame 1, MyObject_0006.obj on frame 2, etc. Negative offsets can be used. For example, if the '''Offset''' value is "-1000" (negative), then MyObject_0001.obj would be loaded on frame 1001, MyObject_0002.obj on frame 1002, etc.</li>
 <li>'''Loop or Ping Pong:''' After Terragen applies '''Offset''' to the current frame number, if the resulting frame number falls outside the range defined by '''Sequence first''' and '''Sequence last''' then '''Loop''' and '''Ping Pong''' are two different ways extend the cycle infinitely, both before the beginning and after the end of the sequence. Upon completion of the sequential object cycle determined by the '''Sequence first''' value and '''Sequence last''' value, the objects can either “loop” back to the '''Sequence first''' object and cycle through the objects as each frame advances, or “ping pong”, that is, reverse the object sequence order until the '''Sequence first''' object is encountered. If neither '''Loop''' nor '''Ping Pong''' are checked then the object will be held at the first or last file in the sequence when the requested frame number falls outside the defined range.</li>

@@ Line 35: / Line 35: @@
 [[File:OBJReader_04_SequenceTab.png|none|460px|Sequence Tab]]
 '''Settings:'''
-<ul><li>'''Sequence first:''' When a supported frame insertion pattern is used in the filename parameter to load a file sequence, '''Sequence first''' and '''Sequence last''' control the range of numbers that are allowed in the file sequence. For example, if you have files with names MyObject_0001.obj to object_0010.obj and want your animation to use them all, you would set '''Sequence first''' and '''Sequence last''' to 1 and 10 respectively.</li>
+<ul><li>'''Sequence first:''' When a supported frame insertion pattern is used in the filename parameter to load a file sequence, '''Sequence first''' and '''Sequence last''' control the range of numbers that are allowed in the file sequence. For example, if you have files with names MyObject_0001.obj to MyObject_0010.obj and want your animation to use them all, you would set '''Sequence first''' and '''Sequence last''' to 1 and 10 respectively.</li>
-<li><li>'''Sequence last:''' When a supported frame insertion pattern is used in the filename parameter to load a file sequence, '''Sequence first''' and '''Sequence last''' control the range of numbers that are allowed in the file sequence. For example, if you have files with names MyObject_0001.obj to object_0010.obj and want your animation to use them all, you would set '''Sequence first''' and '''Sequence last''' to 1 and 10 respectively.</li>
+<li><li>'''Sequence last:''' When a supported frame insertion pattern is used in the filename parameter to load a file sequence, '''Sequence first''' and '''Sequence last''' control the range of numbers that are allowed in the file sequence. For example, if you have files with names MyObject_0001.obj to MyObject_0010.obj and want your animation to use them all, you would set '''Sequence first''' and '''Sequence last''' to 1 and 10 respectively.</li>
 <li>'''Frame offset:''' This value provides a way to load files with sequential numbers that are different from the rendered frame numbers, to shift the timing of the animation or to account for differences in how the frames are numbered in the object filenames. Terragen adds '''Frame offset''' to the project's current frame number to determine which file number to load (with the actual file number being limited to the range defined by '''Sequence first''' and '''Sequence last''' with optional looping or ping-ponging). For example, if the '''Sequence first''' value is "1", the '''Sequence last''' value is "10", and the '''Offset''' value is "4", then MyObject_0005.obj would be loaded on frame 1, MyObject_0006.obj on frame 2, etc. Negative offsets can be used. For example, if the '''Offset''' value is "-1000" (negative), then MyObject_0001.obj would be loaded on frame 1001, MyObject_0002.obj on frame 1002, etc.</li>
 <li>'''Loop or Ping Pong:''' After Terragen applies '''Offset''' to the current frame number, if the resulting frame number falls outside the range defined by '''Sequence first''' and '''Sequence last''' then '''Loop''' and '''Ping Pong''' are two different ways extend the cycle infinitely, both before the beginning and after the end of the sequence. Upon completion of the sequential object cycle determined by the '''Sequence first''' value and '''Sequence last''' value, the objects can either “loop” back to the '''Sequence first''' object and cycle through the objects as each frame advances, or “ping pong”, that is, reverse the object sequence order until the '''Sequence first''' object is encountered. If neither '''Loop''' nor '''Ping Pong''' are checked then the object will be held at the first or last file in the sequence when the requested frame number falls outside the defined range.</li>

@@ Line 30: / Line 30: @@
 '''Settings:'''
-<ul><li>'''Filename:''' This parameter shows the path to the file used by the OBJ Reader. You can use the file button at right to load a different file but this isn't recommended as the materials for the new file won't be loaded.</li></ul>
+<ul><li>'''Filename:''' This parameter shows the path to the file used by the OBJ Reader. You can use the file button at right to load a different file but this isn't recommended as the materials for the new file won't be loaded. To use an OBJ file sequence you can use a limited set of C-style format strings to automatically insert the frame number, for example "MyObject_%04d.obj" may result in "MyObject_0023.obj" on frame 23, depending on the options on the Sequence tab.</li></ul>
 <br />
 == Sequence Tab ==
 [[File:OBJReader_04_SequenceTab.png|none|460px|Sequence Tab]]
 '''Settings:'''
-<ul><li>'''Sequence first:''' This value controls both the geometry and the frame on which that geometry is loaded.  Terragen can cycle through a subset of the total available sequential geometry by specifying the range to use in the '''Sequence first''' and '''Sequence last''' values.  If an '''Offset''' value other than zero is present, that value will be added to the '''Sequence first''' value to determine which geometry is loaded.  If the sequential object number does not exist, Terragen will display a warning message to alert you.</li>
+<ul><li>'''Sequence first:''' When a supported frame insertion pattern is used in the filename parameter to load a file sequence, '''Sequence first''' and '''Sequence last''' control the range of numbers that are allowed in the file sequence. For example, if you have files with names MyObject_0001.obj to object_0010.obj and want your animation to use them all, you would set '''Sequence first''' and '''Sequence last''' to 1 and 10 respectively.</li>
-<li> '''Sequence last:''' This value controls both the geometry and the frame on which that geometry is loaded. Terragen can cycle through a subset of the total available sequential geometry by specifying the range to use in the '''Sequence first''' and '''Sequence last''' values. If an '''Offset''' value other than zero is present, that value will be added to the '''Sequence last''' value to determine which geometry is loaded.  If the sequential object number does not exist, Terragen will display a warning message to alert you.</li>
+<li><li>'''Sequence last:''' When a supported frame insertion pattern is used in the filename parameter to load a file sequence, '''Sequence first''' and '''Sequence last''' control the range of numbers that are allowed in the file sequence. For example, if you have files with names MyObject_0001.obj to object_0010.obj and want your animation to use them all, you would set '''Sequence first''' and '''Sequence last''' to 1 and 10 respectively.</li>
-<li>'''Loop or Ping Pong:''' Upon completion of the sequential object cycle determined by the '''Sequence first''' value and '''Sequence last''' value, Terragen can either “loop” back to the '''Sequence first''' object and cycle through the objects as each frame advances, or it can “ping pong”, that is, reverse the object sequence order until the '''Sequence first''' object is encountered. </li>
+<li>'''Frame offset:''' This value provides a way to load files with sequential numbers that are different from the rendered frame numbers, to shift the timing of the animation or to account for differences in how the frames are numbered in the object filenames. Terragen adds '''Frame offset''' to the project's current frame number to determine which file number to load (with the actual file number being limited to the range defined by '''Sequence first''' and '''Sequence last''' with optional looping or ping-ponging). For example, if the '''Sequence first''' value is "1", the '''Sequence last''' value is "10", and the '''Offset''' value is "4", then MyObject_0005.obj would be loaded on frame 1, MyObject_0006.obj on frame 2, etc. Negative offsets can be used. For example, if the '''Offset''' value is "-1000" (negative), then MyObject_0001.obj would be loaded on frame 1001, MyObject_0002.obj on frame 1002, etc.</li>
-<li>'''Frame offset:''' This value provides a way to load a different sequential object.  Its value is added to the '''Sequence first''' value and '''Sequential last''' value.  For example, if the '''Sequence first''' value is "1", the '''Sequence last''' value is "10", and the '''Offset''' value is "4", then MyObject_0005.obj would load on frame 1.  </li>
+<li>'''Loop or Ping Pong:''' After Terragen applies '''Offset''' to the current frame number, if the resulting frame number falls outside the range defined by '''Sequence first''' and '''Sequence last''' then '''Loop''' and '''Ping Pong''' are two different ways extend the cycle infinitely, both before the beginning and after the end of the sequence. Upon completion of the sequential object cycle determined by the '''Sequence first''' value and '''Sequence last''' value, the objects can either “loop” back to the '''Sequence first''' object and cycle through the objects as each frame advances, or “ping pong”, that is, reverse the object sequence order until the '''Sequence first''' object is encountered. If neither '''Loop''' nor '''Ping Pong''' are checked then the object will be held at the first or last file in the sequence when the requested frame number falls outside the defined range.</li>
 [[File:OBJReader_45_OBJSequence.gif|none|400px|Object sequence options.]]
 </ul>

@@ Line 29: / Line 29: @@
 <li>''' Preview Colour:''' Enabling this parameter causes the object to be drawn in the 3D preview using the preview colour when the object display mode is set to bounding box or wireframe.  When set to smooth shaded or texture display mode, the preview colour tints the object’s textured surface.  This is useful for making a particular object stand out in the 3D preview.  Clicking on the colour swatch to the right of the parameter label opens the [[Colour_Picker|Colour picker pane]].
 </li>
-<br />
+<br /> <br /> </ul>
 == File Read Tab ==
 [[File:OBJReader_03_FileReadTab.png|none|460px|File Read Tab]]
@@ Line 78: / Line 78: @@
 |}
+</ul>
 <br />
 == Mesh Modifiers tab ==
 [[File:OBJReader_12_MeshModifiersTab2.png|none|460px|Mesh Modifiers Tab]]
-'''Settings:''' <br />
 <ul>
-<li>'''Read MDD (motion) file:''' Terragen can apply Motion Designer or “MDD” files created in third-party 3D software packages to an object within the project.  The MDD file contains the position of every vertex in an object, for each frame of an animation.  After an object is animated or otherwise deformed in the third-party 3D software, its vertex positions are “baked”, or saved in the MDD file format.  This allows for complex animation to exist within a Terragen project, that otherwise could not.</li>
+'''Read MDD (motion) file:''' Terragen can apply Motion Designer or “MDD” files created in third-party 3D software packages to an object within the project.  The MDD file contains the position of every vertex in an object, for each frame of an animation.  After an object is animated or otherwise deformed in the third-party 3D software, its vertex positions are “baked”, or saved in the MDD file format.  This allows for complex animation to exist within a Terragen project, that otherwise could not.
 {|
 |-
@@ Line 93: / Line 93: @@
 | [[File:OBJReader_43_MeshModifiers_MDD_Flag.gif|none|400px|Motion Designer file of cloth dynamics simulation.]] || [[File:OBJReader_42_MeshModifiersTab_MDD_WierdWallBulletDynamics_on2s.gif|none|400px|Motion Designer file of bullet dynamics simulation.]] </li>
 |}
-<ul>
+<br />
-<li> '''Reverse Z (right handed)'''  If the MDD file is facing in the wrong direction, you can reverse the Z axis in order to point it in the right direction.  This can occur if the MDD file was created using “Z-up” instead of “Y-up” coordinates in the third party 3D software package. </li>
 [[File:OBJReader_44_MDD_ReverseZ_Bat.gif|none|400px|Effect of enabling the Reverse Z (right handed) parameter.]]
-<li> '''Mesh displacer:'''  The shader assigned to this parameter displaces the object’s vertices (mesh). For example, a power fractal shader can be used to displace the vertices of the 3D object or a population. </li>
 {|
 |-
 | [[File:OBJReader_15_MeshModifiersTab_MeshDisplacer_Cattail.gif|none|400px|Animated parameters on a power fractal to deform a single 3D object.]] || [[File:OBJReader_16_MeshModifiersTab_MeshDisplacer_Population.gif|none|400px|Animated parameters on a power fractal to deform a population.]]
 |-
-| [[File:OBJReader_17_MeshModifiersTab_MeshDisplacer_NonShaderedLeafs.PNG|none|400px|Displacement applied to non-shadered objects.]] || [[File:OBJReader_18_MeshModifiersTab_MeshDisplacer_TexturedLeafs.PNG|none|400px|Displacement applied to textured objects.]]
+| [[File:OBJReader_17_MeshModifiersTab_MeshDisplacer_NonShaderedLeafs2.PNG|none|400px|Displacement applied to non-shadered objects.]] || [[File:OBJReader_18_MeshModifiersTab_MeshDisplacer_TexturedLeafs2.PNG|none|400px|Displacement applied to textured objects.]]
 |}
 <br />
-<li> '''Recalculate Normals: '''  This popup has four options. </li>
+'''Recalculate Normals: '''  This popup has provides four options because of the many different ways in which 3D software applications, exporters and modeling techniques are used to create geometry and MDD files.  The MDD files and shaders assigned to the “Read MDD file” and “Mesh displacer” parameters change the base 3D object’s normals, requiring them to be recomputed in order to render correctly.  The “Recalculate Normals” parameter instructs Terragen how to recompute the normals.
 [[File:OBJReader_41_MeshModifiersTab_RecalcNormalsParams.png|none|378px|Recalculate Normal options.]]
-<ul>
+<ul><br />
-<li>  MDD files and shaders assigned to the “Read MDD file” and “Mesh displacer” parameters change the base 3D object’s normals, requiring them to be recomputed in order to render correctly.  The “Recalculate Normals” parameter instructs Terragen how to recompute the normals. </li>
+'''No:  '''  The normals are unchanged and left as they were in the original Wavefront OBJ, Lightwave LWO, or Terragen TGO formatted object.
-<li>''In the following example images, the polygons on the blue half of the sphere share the same material and smoothing is enabled.  The polygons on the red half of the sphere share the same material and smoothing is disabled.''
+[[File:OBJReader_MeshModifier_RecalcNormals_No.png|none|400px|Normals not recalculated.]]
 <br />
 '''Conservative Update: '''  Only the existing normals are updated. In other words, it relies on the normals to have been mapped to faces in a meaningful way in the original object.  Each recalculated normal is the average of the normals of the faces that use the normal.
@@ Line 141: / Line 126: @@
 <li> Cannot create normals where they didn't previously exist. </li></ul>
 </ul>
-{|
+[[File:OBJReader_MeshModifier_RecalcNormals_Conservative.png|none|400px|Normals recomputed with Conservative Update.]]
 <br />
@@ Line 154: / Line 136: @@
 </ul>
-{|
+[[File:OBJReader_MeshModifier_RecalcNormals_SmoothPreserveCreases.png|none|400px|Normals recalculated with Smooth + Preserve creases.]]
 <br />
@@ Line 166: / Line 145: @@
 <ul><li>Does not produce sharp edges unless the faces use separate vertices.</li></ul>
 </ul>
-{|
+[[File:OBJReader_MeshModifier_RecalcNormals_SmoothEverything.png|none|400px|Normals recomputed with Smooth Everything.]]
 </ul>
+</ul><br />
 == Surface Shaders Tab ==
 [[File:OBJReader_19_SurfaceShadersTab.png|none|460px|Surface Shaders Tab]]
@@ Line 194: / Line 170: @@
 </ul>
 <br />
 == Rendering Tab ==

@@ Line 82: / Line 82: @@
 == Mesh Modifiers tab ==
-[[File:OBJReader_12_MeshModifiersTab.png|none|460px|Mesh Modifiers Tab]]
+[[File:OBJReader_12_MeshModifiersTab2.png|none|460px|Mesh Modifiers Tab]]
 '''Settings:''' <br />
@@ Line 89: / Line 89: @@
 {|
 |-
-| [[File:OBJReader_13_MDD_Melt.gif|none|400px|Motion Designer file of animated melting sequence applied to 3D text geometry.]] || [[File:OBJReader_14_MDD_Bat.gif|none|400px|Motion Designer file of animated flap cycle applied to 3D bat object.]] </li>
+| [[File:OBJReader_13_MDD_Melt_v002.gif|none|400px|Motion Designer file of animated melting sequence applied to 3D text geometry.]] || [[File:OBJReader_14_MDD_Bat.gif|none|400px|Motion Designer file of animated flap cycle applied to 3D bat object.]] </li>
 |}
@@ Line 109: / Line 115: @@
 </ul>
 <br />

@@ Line 25: / Line 25: @@
 <li>'''Preview mode:''' This popup has five options:
 [[File:OBJReader_02_PreviewMode.png|none|234px|Preview Mode parameters]]</li>
-<ul><li> This popup lets you choose how the object should be displayed in the 3D Preview, and sets the most detailed mode that the object can be displayed in. The Object Display Mode button in the 3D Preview controls the mode for the preview as a whole. For example if you set the '''Preview mode''' of the object to Wireframe but the 3D Preview object display mode is set to '''Show as bounding boxes''' then the object will only be drawn as a bounding box.</li></ul>
+<ul><li> This parameter lets you choose how the object should be displayed in the 3D Preview, and sets the most detailed mode that the object can be displayed in. The Object Display Mode button in the 3D Preview controls the mode for the preview as a whole. For example if you set the '''Preview mode''' of the object to Wireframe but the 3D Preview object display mode is set to '''Show as bounding boxes''' then the object will only be drawn as a bounding box.</li></ul>
-<li>''' Preview Colour:''' Enabling this parameter causes the object to be drawn in the 3D preview using the preview colour when the object display mode is set to bounding box or wireframe.  When set to smooth shaded or texture display mode, the preview colour tints the object’s textured surface.  This is useful for making a particular object stand out in the 3D preview.  Clicking on the colour swatch to the right of the parameter label opens the Colour picker pane.
+<li>''' Preview Colour:''' Enabling this parameter causes the object to be drawn in the 3D preview using the preview colour when the object display mode is set to bounding box or wireframe.  When set to smooth shaded or texture display mode, the preview colour tints the object’s textured surface.  This is useful for making a particular object stand out in the 3D preview.  Clicking on the colour swatch to the right of the parameter label opens the [[Colour_Picker|Colour picker pane]].
 </li>
 <br />
@@ Line 109: / Line 109: @@
 </ul>
 <br />
 == Surface Shaders Tab ==
-[[File:OBJReader_19_SurfaceShadersTab.png|none|400px|Surface Shaders Tab]]
+[[File:OBJReader_19_SurfaceShadersTab.png|none|460px|Surface Shaders Tab]]
 '''Settings:'''<br />
 <ul>
-<li>'''Surface shader:'''  </li>
+<li>'''Surface shader:''' Use this parameter to assign a surface shader to the object.  </li>
 <li>'''Smooth polygons at terminator:'''  This fixes self-shadow artifacts at the lighting terminator of polygonal objects where the smooth normals are inconsistent with the geometric normal.  This parameter is enabled by default.</li>
 <!-- [[File:OBJReader_20_SurfaceShadersTab_SmoothPolysTerminator_Problem.jpg|none|948px|Comparison before and after Smooth Polygon Terminator enabled.]] -->
 [[File:OBJReader_21_SurfaceShadersTab_SmoothPolysTerminator_OnOff.jpg|none|400px|Comparison Smooth Polygon Terminator enabled and disabled. ]]
 <li>'''Darken bumps at terminator:'''  This parameter approximates self-shadow of bump maps at the lighting terminator to reduce the chance of seeing a sharp line where the surface falls into shadow.  This parameter is enabled by default.</li>
@@ Line 131: / Line 132: @@
 </ul>
 <br />
 == Rendering Tab ==
@@ Line 151: / Line 153: @@
-<li>'''Visible to camera:''' If this is checked the object is visible to cameras such as the render camera. In other words it will show up in renders. If this is unchecked the object won't show up in renders. However if, for example, the '''Cast shadows''' checkbox is checked then the shadows cast by the object will still be visible.
+<li>'''Visible to other rays:''' When enabled, the object will be taken into account by all the rays determined by the renderer including those from the camera, direct and indirect lighting, etc.  In the example below, a 100% reflective  3D object has been placed behind three coloured spheres in order to mirror the effect of the calculated rays.
 {|
 |-
@@ Line 166: / Line 169: @@
 <li>'''Double-sided surface:''' If this is checked  object surfaces are double sided. A single sided surface is only visible from the "front", which is the direction the surface normal is pointing. If you look at it from the other direction the surface isn't visible. Double sided surfaces are visible from all directions.</li>
 <li>'''Use smooth normals:''' If this is checked the object normals are interpolated to make the surface appear smooth. If it's unchecked the surface will look faceted.</li>
 <li>'''Flip normals:''' Check this to flip or reverse the object normals. You might want to use this on an imported object if it has gaps or strange dark patches when rendered.</li>
 <li>'''Render method''' This popup has three options.
@@ Line 182: / Line 182: @@
 <li>'''Force Ray Trace:'''  When enabled for the object, its surfaces will be ray traced at render time, even if “Ray trace objects” is disabled in the Renderer settings.  This can be useful when “Ray trace objects” is disabled in the Renderer in order for other 3D objects to use displacement, but you want this object to use Ray tracing for the highest quality rendering and it has not been displaced. </li>
 </ul>
 <li>'''Sorting bias (metres)'''  This parameter gives you control over the order in which objects are rendered when using the micropolygon renderer. This does not apply to objects being rendered with the ray tracer.

@@ Line 47: / Line 47: @@
 [[File:OBJReader_08_SequenceTab_SequenceFirst_4-8PingOffset0.gif|400px|Five sequential objects, ping pong, no offset.]]
 <li> If the sequential object number does not exist, Terragen will display a warning message to alert you.</li>
-[[File:OBJReader_09_SequenceTab_SeqeuenceFirst_MissingObjects.png|none|916px|Warning message if sequential object is missing.]]
+[[File:OBJReader_09_SequenceTab_SeqeuenceFirst_MissingObjects.png|none|916px|Warning message if sequential object is missing.]]</ul>
 </ul>
 '''Visible to camera:''' If this is checked the object is visible to cameras such as the render camera. In other words it will show up in renders. If this is unchecked the object won't show up in renders. However if, for example, the '''Cast shadows''' checkbox is checked then the shadows cast by the object will still be visible.