Glass Shader - Revision history

Matt: Image sizes 800, 399x2, 266x3

2020-03-08T08:54:38Z

Image sizes 800, 399x2, 266x3

Matt at 05:47, 4 March 2020

2020-03-04T05:47:15Z

Matt: Roughness examples

2020-03-04T05:40:30Z

Roughness examples

Matt at 05:24, 4 March 2020

2020-03-04T05:24:23Z

Matt: Lighting method in Std/PT

2020-03-04T05:22:08Z

Lighting method in Std/PT

Matt: Added more images

2020-03-04T04:44:58Z

Added more images

Matt at 04:06, 4 March 2020

2020-03-04T04:06:00Z

Matt: Volume density function, volume colour function, evaluate colour function volumetrically.

2020-03-04T03:53:55Z

Volume density function, volume colour function, evaluate colour function volumetrically.

Matt: Volume density and volume colour.

2020-03-04T03:37:09Z

Volume density and volume colour.

Matt: Roughness function

2020-03-04T02:35:18Z

Roughness function

@@ Line 1: / Line 1: @@
-[[File:luYu_glass.jpg|438px]][[File:luYu_glass_density5_decay0.2_allDirections_greenDecay_greenDensity_densityFractal_6AA_36paths.jpg|438px]]
+[[File:luYu_glass.jpg|399px]][[File:luYu_glass_density5_decay0.2_allDirections_greenDecay_greenDensity_densityFractal_6AA_36paths.jpg|399px]]
 ''An imported OBJ object with the Glass Shader applied, rendered by the [[Path Tracing|Path Tracer]]. With default settings (left), and subsurface scattering (right).''
@@ Line 9: / Line 9: @@
-[[File:clearIce.jpg|292px]][[File:cloudyIce.jpg|292px]][[File:saltyIce.jpg|292px]]
+[[File:clearIce.jpg|266px]][[File:cloudyIce.jpg|266px]][[File:saltyIce.jpg|266px]]
 ''An object with the Glass Shader applied, rendered by the Path Tracer.''
@@ Line 39: / Line 39: @@
 * '''Roughness / Specular roughness:''' The microscopic (or subpixel) roughness of the surface. This roughness causes reflections and refractions to look blurry or diffuse, and it changes the apparent size of highlights from bright sources (due to over-exposure). When rendering with the Standard Renderer the roughness only affects reflections/refractions of direct light sources such as the sun. When rendering with the Path Tracer the roughness is applied more correctly, affecting the blurriness of all kinds of reflections and refractions from the surface.
-[[File:sss_roughness_horizontal.jpg|876px]]
+[[File:sss_roughness_horizontal.jpg|800px]]
 ''Examples of roughness affecting not just reflections but also refractions, on an object with subsurface scattering.''
@@ Line 58: / Line 58: @@
 * '''Decay tint:''' An RGB multiplier for the Decay distance. Mathematically it works by multiplying the decay distance separately for the red, green and blue components of the light, but the results are much more interesting. Intuitively you might think of it as the colour of the light that reaches the decay distance, but it can produce an interesting range of hues and saturations that depend on how far the light travels. For realistic results you might want to use pale colours because they automatically become richer where the light travels further than the decay distance.
-[[File:decay.jpg|876px]]
+[[File:decay.jpg|800px]]
 ''Examples of "Decay distance" and "Decay tint". "Decay tint" is set to a pale red colour, the same colour in each example.''
@@ Line 67: / Line 67: @@
 * '''Volume colour:''' The colour of the particles that scatter light back out of the object. This isn't exactly the albedo of the particles, it's the colour of the cumulative effect of multiple scattering (although that is only approximated).
-[[File:density.jpg|876px]]
+[[File:density.jpg|800px]]
 ''Examples of "Volume density" and "Volume colour". "Volume colour" is set to a pale red colour. Only the density varies.
@@ Line 80: / Line 80: @@
 * '''Evaluate colour function volumetrically (without UVs):'''
-[[File:evaluateColourFunctionVolumetrically.jpg|876px]]
+[[File:evaluateColourFunctionVolumetrically.jpg|800px]]
 ''Two different settings of "Evaluate colour function volumetrically". In both examples the texture is projected along on the Z axis'' but they are evaluated differently by the renderer.
-[[File:evaluateColourFunctionVolumetrically_texture.jpg|876px]]
+[[File:evaluateColourFunctionVolumetrically_texture.jpg|800px]]
 ''If the volume colour is driven by a UV-mapped texture, "Evaluate colour function volumetically" must be turned OFF to preserve the UVs.''
@@ Line 97: / Line 97: @@
 ** Subsurface scatter in all directions: The slowest option, this is designed to accurately scatter light through a closed object, especially when it is back-lit. Light passes more realistically through edges and thin parts of the object, and it may also create deeper shadows where appropriate.
-[[File:lightingMethodInPt.jpg|876px]]
+[[File:lightingMethodInPt.jpg|800px]]

@@ Line 98: / Line 98: @@
 [[File:lightingMethodInPt.jpg|876px]]
-See the [[Subsurface Scattering|Subsurface Scattering Guide]].
 [[Category:Surface Shader]]

← Older revision		Revision as of 05:40, 4 March 2020
Line 38:		Line 38:

	* '''Roughness / Specular roughness:''' The microscopic (or subpixel) roughness of the surface. This roughness causes reflections and refractions to look blurry or diffuse, and it changes the apparent size of highlights from bright sources (due to over-exposure). When rendering with the Standard Renderer the roughness only affects reflections/refractions of direct light sources such as the sun. When rendering with the Path Tracer the roughness is applied more correctly, affecting the blurriness of all kinds of reflections and refractions from the surface.		* '''Roughness / Specular roughness:''' The microscopic (or subpixel) roughness of the surface. This roughness causes reflections and refractions to look blurry or diffuse, and it changes the apparent size of highlights from bright sources (due to over-exposure). When rendering with the Standard Renderer the roughness only affects reflections/refractions of direct light sources such as the sun. When rendering with the Path Tracer the roughness is applied more correctly, affecting the blurriness of all kinds of reflections and refractions from the surface.
		+
		+	[[File:sss_roughness_horizontal.jpg\|876px]]
		+
		+	''Examples of roughness affecting not just reflections but also refractions, on an object with subsurface scattering.''
		+

	* '''Roughness function:''' Connection to a shader, shader network or function network that acts as multiplier to the roughness value. For example, this could be an Image Map Shader that loads a roughness map (or an inverted glossiness map).		* '''Roughness function:''' Connection to a shader, shader network or function network that acts as multiplier to the roughness value. For example, this could be an Image Map Shader that loads a roughness map (or an inverted glossiness map).

@@ Line 90: / Line 90: @@
 ** Hard surface approximation: A fast preview of the subsurface effects, approximated with diffuse lighting at the surface.
 ** Subsurface scatter towards normal: A reasonably fast approximation of SSS that is designed for rendering water, but is also good for simple, flat objects such as a table or a slab of marble where the edges are not seen. It may also be useful for a variety of objects where the decay distance is small compared to the curvature of the object.
-** Subsurface scatter in all directions: The slowest option, this is designed to accurately scatter light inside a closed object. Light passes more realistically through edges and thin parts of the object, and it may also create deeper shadows where appropriate.
+** Subsurface scatter in all directions: The slowest option, this is designed to accurately scatter light through a closed object, especially when it is back-lit. Light passes more realistically through edges and thin parts of the object, and it may also create deeper shadows where appropriate.
 [[File:lightingMethodInPt.jpg|876px]]

@@ Line 85: / Line 85: @@
-* '''Lighting method in Std'''
+* '''Lighting method in Std:''' The method used to simulate subsurface scattering when rendering with the Standard Renderer. This has only one mode called "Pseudo-volumetric".
 * '''Lighting method in PT'''
 See the [[Subsurface Scattering|Subsurface Scattering Guide]].

@@ Line 1: / Line 1: @@
-[[File:luYu_glass.jpg|876px]]
+[[File:luYu_glass.jpg|438px]][[File:luYu_glass_density5_decay0.2_allDirections_greenDecay_greenDensity_densityFractal_6AA_36paths.jpg|438px]]
-''An imported OBJ object with the Glass Shader applied (default settings), rendered by the [[Path Tracing|Path Tracer]].''
+''An imported OBJ object with the Glass Shader applied, rendered by the [[Path Tracing|Path Tracer]]. With default settings (left), and subsurface scattering (right).''
@@ Line 7: / Line 7: @@
 The Glass Shader can render subsurface scattering (SSS) which makes it useful for a wide range of materials that have this effect. Ice, smoky glass, ceramic and skin are examples of materials which have SSS. When using SSS, the results are best when rendering with [[Path Tracing]].
@@ Line 35: / Line 40: @@
 * '''Roughness function:''' Connection to a shader, shader network or function network that acts as multiplier to the roughness value. For example, this could be an Image Map Shader that loads a roughness map (or an inverted glossiness map).
 == Sub-surface Tab ==
@@ Line 59: / Line 65: @@
 ''Examples of "Volume density" and "Volume colour". "Volume colour" is set to a pale red colour. Only the density varies.
 * '''Volume density function:''' Connection to a shader, shader network or function network that acts as multiplier to the density value. For example, this could be an Image Map Shader that loads a "cloudiness" map or "bubble density" map. This can provide a richer visual result than simply modulating the colour.
@@ Line 71: / Line 78: @@
 ''Two different settings of "Evaluate colour function volumetrically". In both examples the texture is projected along on the Z axis'' but they are evaluated differently by the renderer.
 * '''Lighting method in Std'''

@@ Line 62: / Line 62: @@
 * '''Volume density function:''' Connection to a shader, shader network or function network that acts as multiplier to the density value. For example, this could be an Image Map Shader that loads a "cloudiness" map or "bubble density" map. This can provide a richer visual result than simply modulating the colour.
-''The tea-with-milk analogy is apt. Black tea mostly absorbs light without scattering it. It can be simulated with an orange-red decay tint. When milk is added it produces a light tan colour. The colour results from the balance (volume density) of the white milk (volume colour = white) to the tea (decay distance, decay tint = orange-red). If you use a volume density function you can also texturize this balance, and this creates a rich spectrum of hues from only two colours. It is more visually interesting than just a mixture of the two colours.''
+''The tea-with-milk analogy is apt. Black tea mostly absorbs light without scattering it. It can be simulated with an orange-red decay tint. When milk is added it produces a light tan colour. The colour results from the balance (volume density) of the white milk (volume colour = white) to the tea (decay distance, decay tint = orange-red). If you use a volume density function you can also texture-map this balance, and this creates a rich spectrum of hues from only two colours. It is more visually interesting than just a linear mixture of the two colours.''
 * '''Volume colour function:''' Connection to a shader, shader network or function network that acts as an RGB multiplier to the volume colour. For example, this could be an Image Map Shader that loads a subsurface scattering texture.

@@ Line 51: / Line 51: @@
 ''Examples of "Decay distance" and "Decay tint". "Decay tint" is set to a pale red colour, the same colour in each example.''
 * '''Volume density'''
-* '''Volume colour'''
+* '''Volume density:''' How "dense" the microscopic particles are which scatter light back out of the object as well as reduce the light passing through it. This produces the effect we call subsurface scattering (SSS). You might think of it as the amount of droplets in a cloud, the quantity of air bubbles in ice, or the proportion of milk in a cup of tea. This density is relative to the "Decay distance"; when Decay distance is short, the absolute density of scattering particles will be higher. It works this way so that the "Volume density" controls the balance of scattering in relation to absorption, making it easier to control the colour of the SSS effect with a wide variety of decay distances.
 * '''Volume density function'''
 * '''Volume colour function'''
 * '''Evaluate colour function volumetrically (without UVs)'''

← Older revision		Revision as of 02:35, 4 March 2020
Line 34:		Line 34:
	* '''Roughness / Specular roughness:''' The microscopic (or subpixel) roughness of the surface. This roughness causes reflections and refractions to look blurry or diffuse, and it changes the apparent size of highlights from bright sources (due to over-exposure). When rendering with the Standard Renderer the roughness only affects reflections/refractions of direct light sources such as the sun. When rendering with the Path Tracer the roughness is applied more correctly, affecting the blurriness of all kinds of reflections and refractions from the surface.		* '''Roughness / Specular roughness:''' The microscopic (or subpixel) roughness of the surface. This roughness causes reflections and refractions to look blurry or diffuse, and it changes the apparent size of highlights from bright sources (due to over-exposure). When rendering with the Standard Renderer the roughness only affects reflections/refractions of direct light sources such as the sun. When rendering with the Path Tracer the roughness is applied more correctly, affecting the blurriness of all kinds of reflections and refractions from the surface.

		+	* '''Roughness function:''' Connection to a shader, shader network or function network that acts as multiplier to the roughness value. For example, this could be an Image Map Shader that loads a roughness map (or an inverted glossiness map).

	== Sub-surface Tab ==		== Sub-surface Tab ==