.shader issue - transition between textures with $lightmap and gfx/sprites

[kwenga]

I was playing with terrain and shaders in overall, and found major problem. Basically, I don't know how to include both $lightmap and randomly generated grass sprites on the same layer of terrain, which contains transition between two different textures.

Example below (single texture):

textures/testmap/terrain_0
{
    q3map_baseshader textures/testmap/terrain_base
    qer_editorimage textures/yavinvalley/junglefloor.jpg
    q3map_material    ShortGrass
    q3map_nolightmap
    cull twosided
    {
        map $lightmap
    }
    {
        map textures/yavinvalley/junglefloor.jpg
        blendFunc GL_DST_COLOR GL_ZERO
    }
    {
    map gfx/sprites/y_grass_tall
            surfaceSprites vertical 36 36 48 650
            ssFademax 4000
            ssFadescale 1
            ssVariance 1 2
            ssWind 0.3
        alphaFunc GE192
        blendFunc GL_SRC_ALPHA GL_ONE_MINUS_SRC_ALPHA
        depthWrite
        rgbGen vertex
    }
}

Single texture, both lightmap and sprites are working very well. No issues with shadows, etc.

 

Main problem (transition):

textures/testmap/terrain_0to2
{
    q3map_baseshader textures/testmap/terrain_base
    qer_editorimage textures/yavinvalley/junglefloor.jpg
    {
        map textures/yavinvalley/junglefloor.jpg
    }
    {
        map textures/yavin/dugdirt.jpg
        blendFunc GL_SRC_ALPHA GL_ONE_MINUS_SRC_ALPHA
        alphaGen vertex
    }
    {
        map $lightmap
        blendFunc GL_DST_COLOR GL_ZERO
    }
}

Here comes the problem. I don't know how to include grass sprites in that part of code. Adding it at the end or in the middle just messes everything up - no shadows, no sprites, many bugs and other unpleasant errors. It's not working anyways. I'm pretty sure its something with blendFunc, and since whole .shader file is still some "magic thing" to me, I can't work it out myself. Help would be really appreciated.

 

[kwenga]

So... is it impossible or what? This lack of responses is confusing. I can change whole concept of my map, but I need to know if it is really necessary. Am I the first one, who ever tried doing this sort of stuff with shaders?

[Tauns]

Random summon...@@Langerd!

[Langerd]

Random summon...@@Langerd!

https://youtu.be/EyGuBM1ELf4?t=5

 

INCOMING!!

I was playing with terrain and shaders in overall, and found major problem. Basically, I don't know how to include both $lightmap and randomly generated grass sprites on the same layer of terrain, which contains transition between two different textures.

Example below (single texture):

textures/testmap/terrain_0
{
    q3map_baseshader textures/testmap/terrain_base
    qer_editorimage textures/yavinvalley/junglefloor.jpg
    q3map_material    ShortGrass
    q3map_nolightmap
    cull twosided
    {
        map $lightmap
    }
    {
        map textures/yavinvalley/junglefloor.jpg
        blendFunc GL_DST_COLOR GL_ZERO
    }
    {
    map gfx/sprites/y_grass_tall
            surfaceSprites vertical 36 36 48 650
            ssFademax 4000
            ssFadescale 1
            ssVariance 1 2
            ssWind 0.3
        alphaFunc GE192
        blendFunc GL_SRC_ALPHA GL_ONE_MINUS_SRC_ALPHA
        depthWrite
        rgbGen vertex
    }
}

Single texture, both lightmap and sprites are working very well. No issues with shadows, etc.

 

Main problem (transition):

textures/testmap/terrain_0to2
{
    q3map_baseshader textures/testmap/terrain_base
    qer_editorimage textures/yavinvalley/junglefloor.jpg
    {
        map textures/yavinvalley/junglefloor.jpg
    }
    {
        map textures/yavin/dugdirt.jpg
        blendFunc GL_SRC_ALPHA GL_ONE_MINUS_SRC_ALPHA
        alphaGen vertex
    }
    {
        map $lightmap
        blendFunc GL_DST_COLOR GL_ZERO
    }
}

Here comes the problem. I don't know how to include grass sprites in that part of code. Adding it at the end or in the middle just messes everything up - no shadows, no sprites, many bugs and other unpleasant errors. It's not working anyways. I'm pretty sure its something with blendFunc, and since whole .shader file is still some "magic thing" to me, I can't work it out myself. Help would be really appreciated.

Can You make screenshots?

[kwenga]

Screenshots won't give you that much of an intel. I know what problem is and I know how to solve it, I just cannot figure out how to include grass thing afterwards. To be fair, I'm not even sure if it is possible, because of the way how .shader file works.

 

 

This screenshot might be slightly dated, but it still shows how it looks in-game. All bright areas are textured by single textures, both shadows and grass implemented. You can clearly see slightly darker area - that's "terrain_0to2" or other transition from shader file. No lightmap on it.  I can easily fix shadows on that, just by adding $lightmap etc. in .shader file, and it will look fine. But that's not the point - I want to put randomly generated sprites on it too, and there it gets complicated or/and impossible.

[Langerd]

Screenshots won't give you that much of an intel. I know what problem is and I know how to solve it, I just cannot figure out how to include grass thing afterwards. To be fair, I'm not even sure if it is possible, because of the way how .shader file works.

 

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This screenshot might be slightly dated, but it still shows how it looks in-game. All bright areas are textured by single textures, both shadows and grass implemented. You can clearly see slightly darker area - that's "terrain_0to2" or other transition from shader file. No lightmap on it.  I can easily fix shadows on that, just by adding $lightmap etc. in .shader file, and it will look fine. But that's not the point - I want to put randomly generated sprites on it too, and there it gets complicated or/and impossible.

Hmm how about that?

 

textures/morch/sand_blend

{

    q3map_material    dirt

    q3map_nonplanar

    q3map_shadeangle 180

    {

        map $lightmap

    }

    {

        map textures/morch/sand_blend

        blendFunc GL_DST_COLOR GL_ZERO

    }

    {

        map textures/imperial/grass

            surfaceSprites flattened 48 24 45 400

            ssFademax 3000

            ssFadescale 2.5

            ssVariance 1 2

            ssWind 0.8

        alphaFunc GE192

        blendFunc GL_ONE GL_ZERO

        depthWrite

        rgbGen exactVertex

    }

}

[kwenga]

Em... That's not what I'm asking for.

Look at my first post. You have to include two textures plus all that blendfunc stuff (so basically whole text from second quote)  AND somehow still find a place for map gfx/sprites part (last {} from first quote).

[Langerd]

Hmm.. Cant You just copy and paste first shader and rename it? I am not good shaders though :S

@mrwonko
@Asgarath83


Help D:

[Xycaleth]

With your problematic shader, does the problem go away if you remove the surface sprite stage? If so, it might be a bug in the renderer code. Surface sprite stages don't have any interaction with the other stages so if adding it in causes issues, it might be engine related rather than something you're doing wrong.

[Langerd]

With your problematic shader, does the problem go away if you remove the surface sprite stage? If so, it might be a bug in the renderer code. Surface sprite stages don't have any interaction with the other stages so if adding it in causes issues, it might be engine related rather than something you're doing wrong.

When i have problems with the shaders i always copy and paste lines from shaders that i want.

 

He should just find the shaders with sprites that works with fog. I think the level with swoops has terrain with this kind of shader.

[kwenga]

@@Langerd, you are still missing a point there. I CAN remove sprite stage, and yes - shadows, light, etc. will work. I can fix that buggy area and make everything look nice and smooth. Well, I could finish map without it. My point is different though.

 

When you're using a shader with a SINGLE texture - grass, mud, stones, whatever, you can simply add that whole gfx/sprites part to your .shader file and it will render it on a surface. It is a common technique, so no witchcraft or magic there.

My case is slightly more complicated. This problematic area is covered by shader which contains TWO blending/mixed textures, so it works different. At that point, I have two options - I could add $lightmap to that shader (creates shadows and all good-looking stuff) OR I could add sprites. In separated cases, it is working. However, I want to add BOTH at the same time, so grass AND lightmap. As @@Xycaleth said, it might be engine related... It might be even impossible, but that's why I'm asking here, looking for an advice from some hardcore modders/mappers/other magicians.

Besides that. thank you for all responses.