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EyeForComplexity · 2011-04-23 05:11:26

hello everyone,

I would like to make my own shaders use the "full global illumination" - "occlusion" effects that can be found in the renderpass settings. I understand that it needs some code from the "global_illumination.h" file found in the 3delight install directory and I think the "getGlobalIllumination()" function. But I have no idea how to use it in my shader or how to add it to the final mix.

at the moment I am just trying to add it to a super basic lambert :

surface LambertGI(float Kd = 0.85;
color surfCol = color (1,1,1);
)
{
normal Nn = normalize(N);

Oi = Os;
Ci = Oi * surfCol * (Kd * diffuse(Nn));

}

If anyone could help me out and show how I could get it to work for this shader I would really appreciate it.

Semir

aghiles · 2011-04-23 10:03:24

A relatively simple way to find out is to check a .sl file that has been generated by 3dfm and go from there. Did you try that ? I would use a simple shader, such as lambert, since complicated hyper shade networks will be hard to follow.
-- Aghiles

EyeForComplexity · 2011-04-24 04:11:05

yes I am trying to figure it out from the 3delight translated shaders but I am still having difficulty to really understand what is going on, there is not really any documentation about it.

maxime · 2011-05-04 16:08:29

Here is something that works with the diffuse GI AOVs:

Code:

surface LambertGI(
    float Kd = 0.85;
    color surfCol = color (1,1,1);

#ifdef USE_AOV_aov_occlusion
    output varying color aov_occlusion = 0;
#endif
#ifdef USE_AOV_aov_env_diffuse
    output varying color aov_env_diffuse = 0;
#endif
#ifdef USE_AOV_aov_indirect
    output varying color aov_indirect = 0;
#endif
#ifdef USE_AOV_aov_gi
    output varying color aov_gi = 0;
#endif
    )
{
    normal Nn = normalize(N);

    // For 3dfm global illumination
    color __transparency = color(1.0);
    #include "global_illumination.h"

    color transparency = 0.0;
    color Cdiff = Kd * diffuse(Nn);
    Cdiff = getGlobalIllumination(Cdiff, transparency);

    Oi = Os;
    Ci = Oi * surfCol * Cdiff;

}

To compile:

Code:

shaderdl -I $DELIGHT/maya/rsl/ -DUSE_AOV_aov_occlusion -DUSE_AOV_aov_env_diffuse -DUSE_AOV_aov_indirect -DUSE_AOV_aov_gi LambertGI.sl

lunatik · 2011-12-20 12:31:56

In case somebody wonders why the point-based global illumination doesn't work (as I did): it's because you have to add this at the end of the shader in order to get the point cloud baked in the prepass.

Code:

illuminance("bakelight", P, "send:light:do_bake", 1)
{
}

Forums

#1 2011-04-23 05:11:26

how do I add renderpass GI/OCC to my written shaders?

#2 2011-04-23 10:03:24

Re: how do I add renderpass GI/OCC to my written shaders?

#3 2011-04-24 04:11:05

Re: how do I add renderpass GI/OCC to my written shaders?

#4 2011-05-04 16:08:29

Re: how do I add renderpass GI/OCC to my written shaders?

Code:

Code:

#5 2011-12-20 12:31:56

Re: how do I add renderpass GI/OCC to my written shaders?

Code:

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