Material: Replace texture color with custom color

Troubleshooting graphics
1

Hi,



I’m trying to tweak the Lighting.j3md to allow replaceing some defined color in the DiffuseMap to another defined color.



I added the following in the material definition file:

[java]

// MaterialParameters:

// Replace color

Color Replace



// Replace by color

Color ReplaceBy



//… Defines: (Technique & GBuf)

REPLACE_COLORS : Replace

[/java]



In GBuf.frag:

[java]

#ifdef REPLACE_COLORS

uniform vec4 m_Replace;

uniform vec4 m_ReplaceBy;

#endif



#ifdef DIFFUSEMAP

vec4 diffuseColor = texture2D(m_DiffuseMap, newTexCoord);

#ifdef REPLACE_COLORS

if(diffuseColor.rgb == m_Replace.rgb) {

diffuseColor = m_ReplaceBy;

}

#endif

#else

vec4 diffuseColor = vec4(1.0, 1.0, 1.0, 1.0);

#endif

[/java]

And the same in Lighting.frag.



However, this doesn’t not seem to work. I’m i correctly testing the diffuse color? How can i debug shaders?



Thank you!



cghislai

2

There are no easy way to debug shaders.

Usually you output a color…but that won’t help since that’s what’s failing for you.



Have you got a shader compilation error, or it just doesn’t display on the screen?

maybe your m_Replace color is never met exactly in the source map…

3

I didn’t had any compile error. It appeared however i was testing it with the material edior, which doesn’t clear its cache when modifying the definition file.



Testing in game works as expected :slight_smile:

I will post a short snippset for color keying as i couldn’t find any here

4
cghislai said:
I didn't had any compile error. It appeared however i was testing it with the material edior, which doesn't clear its cache when modifying the definition file.

yeah shaders changes and j3md changes are not updated in the editor yet
5

j3md changes should be reflected, shader changes not, yeah.

6

A simple ‘reload’ button in the editor would be great :smiley:



I added my use case example on the wiki: https://wiki.jmonkeyengine.org/legacy/doku.php/jme3:advanced:jme3_shaders#exampleadding_color_keying_to_the_lightingj3md_material_definition

7

As a workaround you can load a model, it should clear the assetManager cache completely. A reload button isn’t necessary when theres File listeners checking for changes later.