Shading Technique - Gloss Mapping - Revision history

Darkangel: done

2008-08-06T10:41:58Z

done

Darkangel at 10:41, 6 August 2008

2008-08-06T10:41:06Z

Darkangel at 10:33, 6 August 2008

2008-08-06T10:33:07Z

Darkangel at 10:20, 6 August 2008

2008-08-06T10:20:52Z

Darkangel: Draft layout

2008-08-06T04:15:43Z

Draft layout

New page

{| border="0"
| {{ContentBlock|width=800|color=white
|content={{!!}}

'''I'm still writing this article, based on [http://www.horde3d.org/forums/viewtopic.php?f=1&t=446 this forum post]'''

== Overview ==
'''Defining a gloss map:''' a texture that describes whether a surface area is [http://en.wikipedia.org/wiki/Gloss_%28material_appearance%29 matte or gloss]. This texture is used as a [http://en.wikipedia.org/wiki/Masking_%28in_art%29 mask] for specular highlights.

'''Why might you want to use this technique?''' 
- On materials that visibly vary in "shininess", such as reflective metal that is partially dirty. 

'''Requirements:''' 
- RGBA Color Map, with the alpha channel representing the gloss map 
- Bright areas in the gloss map will by shiny, dark areas will be matte 

== The Technique ==
Seeing as specular lighting is already present in the shaders that are bundled with a new Horde3D installation, adding in a specular mask is exceedingly simple.
In theory this is all we need:
{{CppSourceCode|
description= GLSL Code|
code=
<source lang="cpp" line="1">
todo
</source>}}

''Description of what's going on in the above code''

Here is an example of Horde3D's original parallax shader, with the above modifications applied:
{{CppSourceCode|
description= Full GLSL Fragment Shader |
code=
<source lang="cpp" line="1">
Todo</source>}}

== Example Result ==
Insert image here

== To-Do List for this Article ==
- Add pictures 
- Finish writing the descriptions ;) - this is a draft 

}}
| valign="top" | {{Extension_Summary
|name = Technique - Gloss mapping
|screenshot = todo.jpg
|description = Using an alpha channel to mask specular highlights.
|version = 1.0
|horde3dversion = 1.0 beta
|released = 2008-08-06
|author = [http://www.horde3d.org/forums/memberlist.php?mode=viewprofile&u=30 DarkAngel]|
}}
|}
[[category: Technique]]

@@ Line 60: / Line 60: @@
 == To-Do List for this Article ==
 - Add pictures<BR/>
-- Finish writing the descriptions ;) - this is a draft<BR/>
+- Ask for permission to upload a ZIP of my finished xml/tga files ;)<BR/>
 }}

@@ Line 38: / Line 38: @@
 code=
 <source lang="cpp" line="1">
-//This line of code performs the lighting equation. The hard-coded values of 0.3 are the specular values.
+//This line of code performs the lighting equation. The first hard-coded values of 0.3 is the specular mask value.
 //gl_FragColor.rgb =
 //	calcPhongSpotLight( newPos, normalize( normal ), albedo, 0.3, 16.0, -vsPos.z, 0.3 );
-//Change the "0.3" values to "gloss", Like this:
+//Change the first "0.3" value to "gloss", Like this:
 gl_FragColor.rgb =
-	calcPhongSpotLight( newPos, normalize( normal ), albedo, gloss, 16.0, -vsPos.z, gloss );
+	calcPhongSpotLight( newPos, normalize( normal ), albedo, gloss, 16.0, -vsPos.z, 0.3 );
 </source>}}
@@ Line 51: / Line 51: @@
 code=
 <source lang="cpp" line="1">
-//This line of code saves the material properties. The hard-coded value of 0.3 is the specular value.
+//This line of code saves the material properties. The hard-coded value of 0.3 is the specular mask value.
 setSpecMask( gloss );
 </source>}}

@@ Line 2: / Line 2: @@
 | {{ContentBlock|width=800|color=white
 |content={{!!}}
 == Overview ==
@@ Line 58: / Line 56: @@
 == Example Result ==
-Insert image here
+[http://horde3d.org/forums/download/file.php?id=50 Click here to view]
 == To-Do List for this Article ==

@@ Line 6: / Line 6: @@
 == Overview ==
-'''Defining a gloss map:''' a texture that describes whether a surface area is [http://en.wikipedia.org/wiki/Gloss_%28material_appearance%29 matte or gloss]. This texture is used as a [http://en.wikipedia.org/wiki/Masking_%28in_art%29 mask] for specular highlights.
+'''What is a gloss map?''' a texture that describes whether a surface area is [http://en.wikipedia.org/wiki/Gloss_%28material_appearance%29 matte or gloss]. This texture is used as a [http://en.wikipedia.org/wiki/Masking_%28in_art%29 mask] for specular highlights.
 '''Why might you want to use this technique?'''<br/>
@@ Line 12: / Line 12: @@
 '''Requirements:'''<BR/>
-- RGBA Color Map, with the alpha channel representing the gloss map<BR/>
+- RGBA texture, with the RGB channels representing color (as usual) and the alpha channel representing the gloss map<BR/>
 - Bright areas in the gloss map will by shiny, dark areas will be matte<BR/>
 == The Technique ==
 Seeing as specular lighting is already present in the shaders that are bundled with a new Horde3D installation, adding in a specular mask is exceedingly simple.
-In theory this is all we need:
 {{CppSourceCode|
-description= GLSL Code|
+description= GLSL Code to be modified in both ATTRIBPASS and LIGHTING.|
 code=
 <source lang="cpp" line="1">
-todo
+//This line reads the RGB values of our texture, comment it out:
 </source>}}
-''Description of what's going on in the above code''
+This next change is for the forward shading version only.
-Here is an example of Horde3D's original parallax shader, with the above modifications applied:
+This next change is for the deferred shading version only.
 {{CppSourceCode|
-description= Full GLSL Fragment Shader |
+description= GLSL Code to be modified in ATTRIBPASS.|
 code=
 <source lang="cpp" line="1">
-Todo</source>}}
+//This line of code saves the material properties. The hard-coded value of 0.3 is the specular value.
 == Example Result ==