HowTo:IntroToShaders - Revision history

Nikai: wikilinks

2010-07-25T09:40:37Z

wikilinks

Nikai: sp

2010-07-23T08:38:16Z

Klauss: /* Requirements Overview */ Clarified and corrected texture specifications

2010-03-16T16:19:21Z

‎Requirements Overview: Clarified and corrected texture specifications

Safemode: /* Requirements Overview */

2010-03-16T16:05:18Z

‎Requirements Overview

Klauss: /* Requirements Overview */ Clarified and corrected texture specifications

2010-03-16T15:59:28Z

‎Requirements Overview: Clarified and corrected texture specifications

AzureSky: Added categories

2008-09-10T15:06:18Z

Added categories

pyramid: /* See Also */

2008-05-18T00:54:24Z

‎See Also

pyramid: /* See Also */

2008-05-18T00:39:08Z

‎See Also

pyramid: /* Step by Step Tutorial */

2008-05-18T00:22:51Z

‎Step by Step Tutorial

pyramid: /* Introduction to Shaders, and what they mean to the modelling and texturing pipeline */

2008-05-17T23:42:35Z

‎Introduction to Shaders, and what they mean to the modelling and texturing pipeline

@@ Line 51: / Line 51: @@
 http://deeplayer.com/dan_w/nodulizer/beta/nodulizer.png
-The nodulizer is really a [http://www.blender.org/ Blender3D] .blend file. You throw it into a folder where you want to convert a set of
+The nodulizer is really a [[Links:3D Applications#Blender|Blender3D]] .blend file. You throw it into a folder where you want to convert a set of
 textures, rename the textures to what the nodulizer expects, or else edit the input nodes for them (on the left), adjust
 the scaling factor with that input node at the bottom left corner, and press the Use Nodes button in the menu bar below.
@@ Line 87: / Line 87: @@
 specified in global coords). So, since, on average, a surface is flat, z is usually close to 1. z goes in the blue channel, so normal maps, when you open them in Gimp look very blue. Red gets the dU, but transposed, as the dU could be positive or negative. 50% red means zero. Same with green and dV. So where a surface is flat, the normal map color is red = 0.5, green = 0.5, blue = 1.0
-And you produce them with [http://www.xnormal.net/ xNormal], and/or with [http://nifelheim.dyndns.org/%7ecocidius/normalmap/ the Gimp plugin from nvidia]. The plugin takes a grayscale bumpmap and computes a normal map. xNormal takes a fine mesh and a coarse mesh, and makes a normal map that, when applied to the coarse mesh, makes it appear like the fine mesh.
+And you produce them with [[Links:Graphic Applications#xNormal|xNormal]], and/or with [http://nifelheim.dyndns.org/%7ecocidius/normalmap/ the Gimp plugin from nvidia]. The plugin takes a grayscale bumpmap and computes a normal map. xNormal takes a fine mesh and a coarse mesh, and makes a normal map that, when applied to the coarse mesh, makes it appear like the fine mesh.
 Dual Joe nowadays swears by [http://epsylon.rptd.ch/denormgen.php denormgen]; --says it's easier to use than xnormal, runs on Linux, and

@@ Line 3: / Line 3: @@
 * A diffuse texture is the color of a surface.
-* A spec texture determines what color a certain place on the model ''reflects'', and ''how much''. Not the diffuse colour - the specularity!. Usually and in rough terms, the brighter the specularity, the dimmer the diffuse, and viceversa, since energy must be conserved.
+* A spec texture determines what color a certain place on the model ''reflects'', and ''how much''. Not the diffuse colour - the specularity!. Usually and in rough terms, the brighter the specularity, the dimmer the diffuse, and vice versa, since energy must be conserved.
 * A shininess map (which we locate in the alpha channel of the specular texture) determines how coarse or glossy the surface is; --that is, how sharp or blurry reflections look on it. This is UNRELATED to the material's specularity. For example, glossy paint has low specularity (Fresnel specularity) but the reflections are sharp, making the material look glossy. A sheet of stainless steel, for an opposite example, is highly specular, but reflections on it are blurry, because the surface is rough (non-glossy). A value of 1.0 in spec alpha makes the surface mirror-like; a value of 0.0 in spec alpha makes the surface completely rough, almost fully diffuse. Real materials lie somewhere in between the two.
@@ Line 38: / Line 38: @@
 '''''This is very technical; read at your peril:'''''
-''In more detail, Texture 4 would have the heighth map (bump map) in the green channel, and two "concavities" in the red and blue channels. Well, not concavities, at all, but I didn't know a better term... This is what I mean:''
+''In more detail, Texture 4 would have the height map (bump map) in the green channel, and two "concavities" in the red and blue channels. Well, not concavities, at all, but I didn't know a better term... This is what I mean:''
 ''Suppose you plant a normal at a point on a ship's surface, normalmap considered. Now, suppose this normal is a solid pole with two sticks that pivot at the base and can open up at the top, like a V, symmetrically, like the handles of a wine bottle cork extractor. So, open the sticks like a V until one stick or the other touches any other part of the ship. Write down the angle. Now turn the pole 90 degrees and take another measurement. The two planes of rotation should align with the texture's x and y axes (i.e.: in "tangent space"). These two angle measurements get recorded to red and blue, by an off-line tool yet to be programmed.''
@@ Line 84: / Line 84: @@
 And how high it is, is the z. And the length of the normal vector is normalized to 1. What does that mean? 255, of course. :D Well, the way colors are represented in rgb is 8-bits unsigned, going from 0 to 255. On the other hand, you could think of that as a fractional number i.e.: going from 0/256 to 255/256, which is almost 1. In OpenGl it is customary to work with 0-0.994 representation.
-In a '''''tangent space''''' normal map, normals are specified relateive to the surface (as opposed to older normal maps where x y and z were
+In a '''''tangent space''''' normal map, normals are specified relative to the surface (as opposed to older normal maps where x y and z were
 specified in global coords). So, since, on average, a surface is flat, z is usually close to 1. z goes in the blue channel, so normal maps, when you open them in Gimp look very blue. Red gets the dU, but transposed, as the dU could be positive or negative. 50% red means zero. Same with green and dV. So where a surface is flat, the normal map color is red = 0.5, green = 0.5, blue = 1.0

@@ Line 5: / Line 5: @@
 * A spec texture determines what color a certain place on the model ''reflects'', and ''how much''. Not the diffuse colour - the specularity!. Usually and in rough terms, the brighter the specularity, the dimmer the diffuse, and viceversa, since energy must be conserved.
-* A shininess map (which we locate in the alpha channel of the specular texture) determines how coarse or glossy the surface is; --that is, how sharp or blurry reflections look on it. This is UNRELATED to the material's specularity. For example, glossy paint has low specularity (Fresnel specularity) but the reflections are sharp, making the material look glossy. A sheet of stainless steel, for an opposite example, is highly specular, but reflections on it are blurry, because the surface is rough (non-glossy). A value of 1.0 in spec alpha makes the surface maximally glossy; a value of 0.0 in spec alpha makes the surface maximally rough.
+* A shininess map (which we locate in the alpha channel of the specular texture) determines how coarse or glossy the surface is; --that is, how sharp or blurry reflections look on it. This is UNRELATED to the material's specularity. For example, glossy paint has low specularity (Fresnel specularity) but the reflections are sharp, making the material look glossy. A sheet of stainless steel, for an opposite example, is highly specular, but reflections on it are blurry, because the surface is rough (non-glossy). A value of 1.0 in spec alpha makes the surface mirror-like; a value of 0.0 in spec alpha makes the surface completely rough, almost fully diffuse. Real materials lie somewhere in between the two.
 * A normal map is quite difficult to make, it is a purple texture that changes the normal of a surface, so that it looks like the surface is bumped (Used for making details like armor plates). Normal maps should be baked with tools designed to do that.

@@ Line 5: / Line 5: @@
 * A spec texture determines what color a certain place on the model ''reflects'', and ''how much''. Not the diffuse colour - the specularity!. Usually and in rough terms, the brighter the specularity, the dimmer the diffuse, and viceversa, since energy must be conserved.
-* A shininess texture determines the roughness of the surface, that is, how mirror-like the material ''reflects''. (Black and white). Black would mean the material is very rough, close to completely diffuse, and white it would mean it's a mirror. Normal materials lie somewhere in the middle.
+* A shininess map (which we locate in the alpha channel of the specular texture) determines how coarse or glossy the surface is; --that is, how sharp or blurry reflections look on it. This is UNRELATED to the material's specularity. For example, glossy paint has low specularity (Fresnel specularity) but the reflections are sharp, making the material look glossy. A sheet of stainless steel, for an opposite example, is highly specular, but reflections on it are blurry, because the surface is rough (non-glossy). A value of 1.0 in spec alpha makes the surface maximally glossy; a value of 0.0 in spec alpha makes the surface maximally rough.
 * A normal map is quite difficult to make, it is a purple texture that changes the normal of a surface, so that it looks like the surface is bumped (Used for making details like armor plates). Normal maps should be baked with tools designed to do that.

@@ Line 3: / Line 3: @@
 * A diffuse texture is the color of a surface.
-* A spec texture determines what color a certain place on the model _reflects_. Not the diffuse colour - the specularity!
+* A spec texture determines what color a certain place on the model ''reflects'', and ''how much''. Not the diffuse colour - the specularity!. Usually and in rough terms, the brighter the specularity, the dimmer the diffuse, and viceversa, since energy must be conserved.
-* A shininess texture determines how MUCH a certain place on the model _reflects_. (Black and white)
+* A shininess texture determines the roughness of the surface, that is, how mirror-like the material ''reflects''. (Black and white). Black would mean the material is very rough, close to completely diffuse, and white it would mean it's a mirror. Normal materials lie somewhere in the middle.
-* A normal map is quite difficult to make, it is a purple texture that changes the normal of a surface, so that it looks like the surface is bumped (Used for making details like armor plates).
+* A normal map is quite difficult to make, it is a purple texture that changes the normal of a surface, so that it looks like the surface is bumped (Used for making details like armor plates). Normal maps should be baked with tools designed to do that.
 * A damage texture is basically a diffuse texture but with scratches and holes in it. Gets faded-in when the ship is damaged.
-* A glow texture is that one that glows by itself without any light shining on it.
+* A glow texture is that one that glows by itself without any light shining on it. It specifies emissive parts of the model, like lit windows, baked static lights, etc...

← Older revision		Revision as of 15:06, 10 September 2008
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	* LaGrande Noodle [[http://wcpedia.com/dw/doku.php/wc_info/modding/texturing_noodle WC Junction Wiki]]		* LaGrande Noodle [[http://wcpedia.com/dw/doku.php/wc_info/modding/texturing_noodle WC Junction Wiki]]
	* Modeling and Texturing Workflow [[http://wcjunction.com/phpBB2/viewtopic.php?t=568 WC Junction Forums]]		* Modeling and Texturing Workflow [[http://wcjunction.com/phpBB2/viewtopic.php?t=568 WC Junction Forums]]
		+
		+	[[Category:HowTos\|Shaders]]
		+	[[Category:Modeling\|Shaders]]

@@ Line 210: / Line 210: @@
 = See Also =
 * LaGrande Noodle [[http://wcpedia.com/dw/doku.php/wc_info/modding/texturing_noodle WC Junction Wiki]]
 * Modeling and Texturing Workflow [[http://wcjunction.com/phpBB2/viewtopic.php?t=568 WC Junction Forums]]

← Older revision		Revision as of 00:39, 18 May 2008
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	= See Also =		= See Also =
−	* LaGrande Noodle [[http://wcpedia.com/dw/doku.php/wc_info/modding/texturing_noodle ~~LaGrande~~]]	+	* LaGrande Noodle [[http://wcpedia.com/dw/doku.php/wc_info/modding/texturing_noodle WC Junction Wiki]]
		+	* Modeling and Texturing Workflow [[http://wcjunction.com/phpBB2/viewtopic.php?t=568 WC Junction Forums]]

← Older revision		Revision as of 00:22, 18 May 2008
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	All done!		All done!
		+
		+	= See Also =
		+	* LaGrande Noodle [[http://wcpedia.com/dw/doku.php/wc_info/modding/texturing_noodle LaGrande]]

← Older revision		Revision as of 23:42, 17 May 2008
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		+	= Requirements Overview =
		+
		+	* A diffuse texture is the color of a surface.
		+
		+	* A spec texture determines what color a certain place on the model _reflects_. Not the diffuse colour - the specularity!
		+
		+	* A shininess texture determines how MUCH a certain place on the model _reflects_. (Black and white)
		+
		+	* A normal map is quite difficult to make, it is a purple texture that changes the normal of a surface, so that it looks like the surface is bumped (Used for making details like armor plates).
		+
		+	* A damage texture is basically a diffuse texture but with scratches and holes in it. Gets faded-in when the ship is damaged.
		+
		+	* A glow texture is that one that glows by itself without any light shining on it.
		+
		+
	==== Introduction to Shaders, and what they mean to the modelling and texturing pipeline ====		==== Introduction to Shaders, and what they mean to the modelling and texturing pipeline ====