Add Scalar - Revision history

Redmaw: Disabled table of contents for now, until Fun With section has some examples.

2022-01-28T22:31:49Z

Disabled table of contents for now, until Fun With section has some examples.

2022-01-28T22:30:52Z

Removed text overlays from images in favor of text descriptions between example images.

2022-01-28T03:59:22Z

Changed wording of luminance conversion and removed "from the zero origin" when talking about the length of a vector.

2022-01-21T06:38:15Z

Repointed GUI image to clean version.

2022-01-21T06:35:57Z

Added additional example image to Fun With section, showing scalar data fed into Add scalar node.

2022-01-21T05:00:16Z

Fixed typo and colour description on last image.

2022-01-21T04:45:59Z

Removed example image of VDM because displacement cancelled out vector data

2022-01-21T01:48:23Z

Edited overview for clarity.

2022-01-21T01:21:14Z

Capitalizing S in Add Scalar

2022-01-21T01:19:14Z

Correction to previous edit

@@ Line 14: / Line 14: @@
-'''Settings:'''
+In the example image below, the Add Scalar node simply adds the scalar values from the nodes assigned to it.
-== Fun with Add Scalar ==
+The Add Scalar node requires scalar data.  One way to convert colour data to scalar data is shown below, where the Luminance to scalar node is used to convert the colour output of the Power fractal node.
-[[File:AddScalar_05_VectorInputs.JPG|none|800px|When vector values are used as the source, the scalar values are based on the length of the vector from a zero origin.]]
+<!-- [[File:AddScalar_17_VectorAndColourInputs.JPG|400px]] -->
-[[File:AddScalar_08_VectorAndColourInputs.JPG|none|800px|Vector and colour values can be used simultaneously as inputs to the Add Scalar node.  Their component values are converted as necessary and output as scalar data.]]
+'''Settings:'''

@@ Line 9: / Line 9: @@
 The Add Scalar node adds two scalars together. It wants the incoming data to be scalars, but it will convert colours and vectors to scalars if necessary.
-* When the source of the incoming data is colour data, the Add Scalar node converts the data to scalar based on the component's luminance values.  The math for this is: 0.2125 * r + 0.7152 *g + 0.0724 * b.
+* When the source of the incoming data is colour data, the Add Scalar node converts the data to scalar based on the luminance of the colour.  The math for this is: 0.2125 * r + 0.7152 *g + 0.0724 * b.
-* When the source of the incoming data is vector data, the Add Scalar node converts the data to scalar based on the length of the vector from the zero origin.  The math for this is: square_root(x*x + y*y + z*z).
+* When the source of the incoming data is vector data, the Add Scalar node converts the data to scalar based on the length of the vector.  The math for this is: square_root(x*x + y*y + z*z).

← Older revision		Revision as of 06:38, 21 January 2022
Line 1:		Line 1:
−	[[File:~~AddScalar_00_GUI~~.png\|none\|470px\|Add Scalar]]	+	[[File:AddScalar_00a_GUI.png\|none\|470px\|Add Scalar]]

← Older revision		Revision as of 06:35, 21 January 2022
Line 21:		Line 21:

	== Fun with Add Scalar ==		== Fun with Add Scalar ==
		+
		+	[[File:AddScalar_09_ScalarToScalar.JPG\|none\|800px\|The Add scalar node requires scalar data. Here the colour output from the red nodes is converted to scalar data via the Luminous to scalar nodes.]]
		+

	[[File:AddScalar_01_MainInputAndInput2.JPG\|none\|800px\| Add scalar combines the Main Input and Input 2 component values, discarding displacement data, and outputting scalar data.]]		[[File:AddScalar_01_MainInputAndInput2.JPG\|none\|800px\| Add scalar combines the Main Input and Input 2 component values, discarding displacement data, and outputting scalar data.]]

← Older revision		Revision as of 05:00, 21 January 2022
Line 37:		Line 37:


−		+	[[File:AddScalar_08_VectorAndColourInputs.JPG\|none\|800px\|Vector and colour values can be used simultaneously as inputs to the Add Scalar node. Their component values are converted as necessary and output as scalar data.]]
−	[[File:~~AddScalar_06_VectorAndColourInputs~~.JPG\|none\|800px\|Vector and colour values can be used simultaneously as inputs to the Add Scalar node. Their component values are converted as necessary and output as scalar data.]]
−

← Older revision		Revision as of 04:45, 21 January 2022
Line 41:		Line 41:


−
−	~~[[File:AddScalar_07_VDMAndColourInputs.JPG\|none\|800px\|No matter the type of source data, the output of the Add Scalar node is scalar data.]]~~

@@ Line 7: / Line 7: @@
 The Add family of nodes allow you to add the colour/scalar/vector coming into the Main Input by the color/scalar/vector coming into Input 2.
-The Add scalar node wants the incoming data to be scalars, but it will convert colours and vectors to scalars if necessary.
+The Add Scalar node wants the incoming data to be scalars, but it will convert colours and vectors to scalars if necessary.
-When the source of the incoming data is colour data, the Add scalar node converts the data to scalar based on the component's luminance values.  The math for this is: 0.2125 * r + 0.7152 *g + 0.0724 * b.
+When the source of the incoming data is colour data, the Add Scalar node converts the data to scalar based on the component's luminance values.  The math for this is: 0.2125 * r + 0.7152 *g + 0.0724 * b.
-When the source of the incoming data is vector data, the Add scalar node converts the data to scalar based on the length of the vector from the zero origin.  The math for this is: square_root(x*x + y*y + z*z).
+When the source of the incoming data is vector data, the Add Scalar node converts the data to scalar based on the length of the vector from the zero origin.  The math for this is: square_root(x*x + y*y + z*z).
 All nodes in this family have just one setting, which lets you assign a shader or function nodes to Input 2.