Rendering学習日記

• RenderMan
• 2010.12.04 Saturday

javaファイルを見ながら、地道に実験してみる。Essential RenderManを参考にして、mixtest shaderを作ってみた。RenderManシェーダの基本ですね。jrManの中でmix()がどうなっているか、src folderのFloatGrid.javaに実装されていました。

/*

 SurfaceMixtest.java

*/



import javax.vecmath.Color3f;



import org.jrman.grid.FloatGrid;

import org.jrman.grid.Color3fGrid;

import org.jrman.grid.Vector3fGrid;

import org.jrman.parameters.Declaration;

import org.jrman.parameters.UniformScalarFloat;

import org.jrman.parameters.UniformScalarTuple3f;

import org.jrman.render.ShaderVariables;

import org.jrman.shaders.SurfaceShader;



public class SurfaceMixtest extends SurfaceShader {



    private static Vector3fGrid vg1 = new Vector3fGrid();



    private static Vector3fGrid vg2 = new Vector3fGrid();



    private static FloatGrid fg1 = new FloatGrid();



    private static Color3fGrid cg1 = new Color3fGrid();



    private static Color3fGrid cg2 = new Color3fGrid();



    private static Color3fGrid cg3 = new Color3fGrid();



    private static Color3fGrid ct1 = new Color3fGrid();



    private static Color3f specularcolor = new Color3f();

    

    private static Color3f color1 = new Color3f();

    

    private static Color3f WHITE = new Color3f(1f, 1f, 1f);



    protected void initDefaults() {

        defaultParameters.addParameter(

            new UniformScalarFloat(new Declaration("Ka", "uniform float"), 1f));

        defaultParameters.addParameter(

            new UniformScalarFloat(new Declaration("Kd", "uniform float"), .5f));

        defaultParameters.addParameter(

            new UniformScalarFloat(new Declaration("Ks", "uniform float"), .5f));

        defaultParameters.addParameter(

            new UniformScalarFloat(new Declaration("roughness", "uniform float"), .1f));

        defaultParameters.addParameter(

            new UniformScalarTuple3f(

                new Declaration("specularcolor", "uniform color"),

                1f,

                1f,

                1f));

        defaultParameters.addParameter(

            new UniformScalarTuple3f(

                new Declaration("color1", "uniform color"),

                0f,

                1f,

                0f));

    }



    public void shade(ShaderVariables sv) {

        super.shade(sv);

        UniformScalarFloat paramKa = (UniformScalarFloat) getParameter(sv, "Ka");

        final float Ka = paramKa.getValue();

        UniformScalarFloat paramKd = (UniformScalarFloat) getParameter(sv, "Kd");

        final float Kd = paramKd.getValue();

        UniformScalarFloat paramKs = (UniformScalarFloat) getParameter(sv, "Ks");

        final float Ks = paramKs.getValue();

        UniformScalarFloat paramRoughness = (UniformScalarFloat) getParameter(sv, "roughness");

        final float roughness = paramRoughness.getValue();

        UniformScalarTuple3f paramSpecularcolor =

            (UniformScalarTuple3f) getParameter(sv, "specularcolor");

        paramSpecularcolor.getValue(specularcolor);

        UniformScalarTuple3f paramColor1 =

            (UniformScalarTuple3f) getParameter(sv, "color1");

        paramColor1.getValue(color1);

		

        vg1.normalize(sv.N);

        vg1.faceforward(vg1, sv.I);

        vg2.normalize(sv.I);

        vg2.negate(vg2);

        

        fg1.set(sv.t);

        

        cg3.set(color1);

        

        sv.Cs.mix(sv.Cs, cg3, fg1);

        

        ct1.set(sv.Cs);

        

        sv.Oi.set(sv.Os);

        ambient(sv, cg1);

        cg3.set(Ka);

        cg1.mul(cg1, cg3);

        diffuse(sv, vg1, cg2);

        cg3.set(Kd);

        cg2.mul(cg2, cg3);

        cg1.add(cg1, cg2);

        specular(sv, vg1, vg2, roughness, cg2);

        cg3.set(Ks);

        cg2.mul(cg2, cg3);

        cg3.set(specularcolor);

        cg2.mul(cg2, cg3);

        cg1.add(cg1, cg2);

        cg1.mul(cg1, ct1);

        sv.Ci.mul(sv.Os, cg1);

    }



}

RIBは以下のようになります。tを使いました。

#mixtest.rib

Display "mixtest.png" "framebuffer" "rgb"

Format 640 480 1

Projection "perspective" "fov" [45]

LightSource "ambientlight" 1 "intensity" [0.2]

LightSource "spotlight" 2 "from" [-1 1 0 ] "to" [0 0 3] "intensity" [10]

Translate 0 0 3

WorldBegin

Color [1 0 0]

Surface "mixtest"

Rotate 90 1 0 0

#Rotate 180 1 0 0

#Patch "bilinear" "P" [-1 -1 0 1 -1 0 -1 1 0 1 1 0]

Sphere 1 -1 1 360

WorldEnd

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