Anyone successfully implemented model texturing using vert coloring?

[Scott Richmond]

I'm about to attempt to create a simple model in Maya 2013 and texture it using vertex coloring. What I want to do is be able to procedurally texture the model via code and a shader using vertex painting. In Maya I will define the color of the vertex's and then supply the textures in the shader at runtime.

 

For example a 2D plane model:

x = a vertex

x---x---x

| \ | / |

x---x---x

| / | \ |

x---x---x

 

I want each of the verts to have their own color that I can assign a texture to in runtime.

 

In this thread I'd like to ask if anyone has been able to do this successfully from Maya?

 

Any other advice?

[Canardia]

Leadwerks supports vertex coloring. I imported once a vertex colored car and it looked quite decent without any textures. Not sure what formats Maya supports, but with UU3D you should be able to get it right into Leadwerks.

[Scott Richmond]

I appear to have been able to import a model with vertex coloring - The untextured model itself has the colors I specified.

Now I need to work out how to access these colors in a frag shader and apply blends between textures. Any ideas or resources to check out?

[LordHippo]

I appear to have been able to import a model with vertex coloring - The untextured model itself has the colors I specified.

Now I need to work out how to access these colors in a frag shader and apply blends between textures. Any ideas or resources to check out?

 

"fragcolor" is what you're looking for.

[Scott Richmond]

"fragcolor" is what you're looking for.

Thanks mate. I'll do some research around that when I get home. Would love any examples too though.

[shadmar]

Are you trying to make a texture splatting shader from rgba vertex colors for terrain?

 

This

 

Translates to

[LordHippo]

Are you trying to make a texture splatting shader from rgba vertex colors for terrain?

 

This

 

Translates to

 

I think this is the way LE does terrain texturing.

[Scott Richmond]

Are you trying to make a texture splatting shader from rgba vertex colors for terrain?

More or less exactly that yes Shadmar. However I'll need more than 3 textures (pure R, B and G).

[shadmar]

It's simple to do RGB plus A for the fourth, but if you need more than 4 it gets complicated since all colors consist of RGB.

You need to have layers of multiple RGBA maps blended with a mask. I don't think you can't have vertexcolors only then.

[Scott Richmond]

It's simple to do RGB plus A for the fourth, but if you need more than 4 it gets complicated since all colors consist of RGB.

You need to have layers of multiple RGBA maps blended with a mask. I don't think you can't have vertexcolors only then.

Ah I thought that was the case. What are my options Shadmar? What do the LE terrain shaders do to achieve 16 texture layers?

What about using UV channels?

[shadmar]

I haven't studied the terrain shaders that comes with LE.

No lesdk on my phone (on vacation) :-)

[Scott Richmond]

I haven't studied the terrain shaders that comes with LE.

No lesdk on my phone (on vacation) :-)

haha no problems mate. Would love your advise once you're back from vacation though.

[shadmar]

From what I can see the default LE terain shader uses 16 textures, but you can't use all those for different stuff like rock,grass,snow,sand etc..

 

So basic RGBA blend is used here too.. I would guess with accompanying bump textures, and base color texture.

 

These are the textures fetched in terrain.frag :

 

uniform sampler2D texture0;// texture0
uniform sampler2D texture1;// bumpmap0
uniform sampler2D texture2;// texture1
uniform sampler2D texture3;// bumpmap1
uniform sampler2D texture4;// texture2
uniform sampler2D texture5;// bumpmap2
uniform sampler2D texture6;// texture3
uniform sampler2D texture7;// bumpmap3
uniform sampler2D texture8;// texture4
uniform sampler2D texture9;// bumpmap4
uniform sampler2D texture10;// basetexture
uniform sampler2D texture11;// tilemap
uniform sampler2D texture12;// colormap
uniform sampler2D texture13;// alphatexture
uniform sampler2D texture14;// normaltexture
uniform sampler2D texture15;//heightmap

[Aily]

http://www.leadwerks.com/werkspace/files/file/234-lme-basic/

 

Here is implemented by vertex paint shaders only two layers, take a look at shaders code.

[Scott Richmond]

From what I can see the default LE terain shader uses 16 textures, but you can't use all those for different stuff like rock,grass,snow,sand etc..

 

So basic RGBA blend is used here too.. I would guess with accompanying bump textures, and base color texture.

 

These are the textures fetched in terrain.frag :

 

uniform sampler2D texture0;// texture0
uniform sampler2D texture1;// bumpmap0
uniform sampler2D texture2;// texture1
uniform sampler2D texture3;// bumpmap1
uniform sampler2D texture4;// texture2
uniform sampler2D texture5;// bumpmap2
uniform sampler2D texture6;// texture3
uniform sampler2D texture7;// bumpmap3
uniform sampler2D texture8;// texture4
uniform sampler2D texture9;// bumpmap4
uniform sampler2D texture10;// basetexture
uniform sampler2D texture11;// tilemap
uniform sampler2D texture12;// colormap
uniform sampler2D texture13;// alphatexture
uniform sampler2D texture14;// normaltexture
uniform sampler2D texture15;//heightmap

 

How is it able to use so many textures with RGBA texturing though? Can it be extended further?