Examples with Color org.sunflow.image.Color used on opensource projects

Example 26 with Color

use of org.sunflow.image.Color in project joons-renderer by joonhyublee.

the class AnisotropicWardShader method scatterPhoton.

public void scatterPhoton(ShadingState state, Color power) {
    // make sure we are on the right side of the material
    state.faceforward();
    Color d = getDiffuse(state);
    state.storePhoton(state.getRay().getDirection(), power, d);
    float avgD = d.getAverage();
    float avgS = rhoS.getAverage();
    double rnd = state.getRandom(0, 0, 1);
    if (rnd < avgD) {
        // photon is scattered diffusely
        power.mul(d).mul(1.0f / avgD);
        OrthoNormalBasis onb = state.getBasis();
        double u = 2 * Math.PI * rnd / avgD;
        double v = state.getRandom(0, 1, 1);
        float s = (float) Math.sqrt(v);
        float s1 = (float) Math.sqrt(1.0f - v);
        Vector3 w = new Vector3((float) Math.cos(u) * s, (float) Math.sin(u) * s, s1);
        w = onb.transform(w, new Vector3());
        state.traceDiffusePhoton(new Ray(state.getPoint(), w), power);
    } else if (rnd < avgD + avgS) {
        // photon is scattered specularly
        power.mul(rhoS).mul(1 / avgS);
        OrthoNormalBasis basis = state.getBasis();
        Vector3 in = state.getRay().getDirection().negate(new Vector3());
        double r1 = rnd / avgS;
        double r2 = state.getRandom(0, 1, 1);
        float alphaRatio = alphaY / alphaX;
        float phi = 0;
        if (r1 < 0.25) {
            double val = 4 * r1;
            phi = (float) Math.atan(alphaRatio * Math.tan(Math.PI / 2 * val));
        } else if (r1 < 0.5) {
            double val = 1 - 4 * (0.5 - r1);
            phi = (float) Math.atan(alphaRatio * Math.tan(Math.PI / 2 * val));
            phi = (float) Math.PI - phi;
        } else if (r1 < 0.75) {
            double val = 4 * (r1 - 0.5);
            phi = (float) Math.atan(alphaRatio * Math.tan(Math.PI / 2 * val));
            phi += Math.PI;
        } else {
            double val = 1 - 4 * (1 - r1);
            phi = (float) Math.atan(alphaRatio * Math.tan(Math.PI / 2 * val));
            phi = 2 * (float) Math.PI - phi;
        }
        float cosPhi = (float) Math.cos(phi);
        float sinPhi = (float) Math.sin(phi);
        float denom = (cosPhi * cosPhi) / (alphaX * alphaX) + (sinPhi * sinPhi) / (alphaY * alphaY);
        float theta = (float) Math.atan(Math.sqrt(-Math.log(1 - r2) / denom));
        float sinTheta = (float) Math.sin(theta);
        float cosTheta = (float) Math.cos(theta);
        Vector3 h = new Vector3();
        h.x = sinTheta * cosPhi;
        h.y = sinTheta * sinPhi;
        h.z = cosTheta;
        basis.transform(h);
        Vector3 o = new Vector3();
        float ih = Vector3.dot(h, in);
        o.x = 2 * ih * h.x - in.x;
        o.y = 2 * ih * h.y - in.y;
        o.z = 2 * ih * h.z - in.z;
        Ray r = new Ray(state.getPoint(), o);
        state.traceReflectionPhoton(r, power);
    }
}

Example 27 with Color

use of org.sunflow.image.Color in project joons-renderer by joonhyublee.

the class DiffuseShader method scatterPhoton.

public void scatterPhoton(ShadingState state, Color power) {
    Color diffuse;
    // make sure we are on the right side of the material
    if (Vector3.dot(state.getNormal(), state.getRay().getDirection()) > 0.0) {
        state.getNormal().negate();
        state.getGeoNormal().negate();
    }
    diffuse = getDiffuse(state);
    state.storePhoton(state.getRay().getDirection(), power, diffuse);
    float avg = diffuse.getAverage();
    double rnd = state.getRandom(0, 0, 1);
    if (rnd < avg) {
        // photon is scattered
        power.mul(diffuse).mul(1.0f / avg);
        OrthoNormalBasis onb = state.getBasis();
        double u = 2 * Math.PI * rnd / avg;
        double v = state.getRandom(0, 1, 1);
        float s = (float) Math.sqrt(v);
        float s1 = (float) Math.sqrt(1.0 - v);
        Vector3 w = new Vector3((float) Math.cos(u) * s, (float) Math.sin(u) * s, s1);
        w = onb.transform(w, new Vector3());
        state.traceDiffusePhoton(new Ray(state.getPoint(), w), power);
    }
}

Example 28 with Color

use of org.sunflow.image.Color in project joons-renderer by joonhyublee.

the class IDShader method getRadiance.

public Color getRadiance(ShadingState state) {
    Vector3 n = state.getNormal();
    float f = n == null ? 1.0f : Math.abs(state.getRay().dot(n));
    return new Color(state.getInstance().hashCode()).mul(f);
}

Example 29 with Color

use of org.sunflow.image.Color in project joons-renderer by joonhyublee.

the class ShinyDiffuseShader method getRadiance.

public Color getRadiance(ShadingState state) {
    // make sure we are on the right side of the material
    state.faceforward();
    // direct lighting
    state.initLightSamples();
    state.initCausticSamples();
    Color d = getDiffuse(state);
    Color lr = state.diffuse(d);
    if (!state.includeSpecular()) {
        return lr;
    }
    float cos = state.getCosND();
    float dn = 2 * cos;
    Vector3 refDir = new Vector3();
    refDir.x = (dn * state.getNormal().x) + state.getRay().getDirection().x;
    refDir.y = (dn * state.getNormal().y) + state.getRay().getDirection().y;
    refDir.z = (dn * state.getNormal().z) + state.getRay().getDirection().z;
    Ray refRay = new Ray(state.getPoint(), refDir);
    // compute Fresnel term
    cos = 1 - cos;
    float cos2 = cos * cos;
    float cos5 = cos2 * cos2 * cos;
    Color ret = Color.white();
    Color r = d.copy().mul(refl);
    ret.sub(r);
    ret.mul(cos5);
    ret.add(r);
    return lr.add(ret.mul(state.traceReflection(refRay, 0)));
}

Example 30 with Color

use of org.sunflow.image.Color in project joons-renderer by joonhyublee.

the class CornellBox method scatterPhoton.

@Override
public void scatterPhoton(ShadingState state, Color power) {
    int side = state.getPrimitiveID();
    Color kd = null;
    switch(side) {
        case 0:
            kd = left;
            break;
        case 1:
            kd = right;
            break;
        case 3:
            kd = back;
            break;
        case 4:
            kd = bottom;
            break;
        case 5:
            float lx = state.getPoint().x;
            float ly = state.getPoint().y;
            if (lx >= lxmin && lx < lxmax && ly >= lymin && ly < lymax && state.getRay().dz > 0) {
                return;
            }
            kd = top;
            break;
        default:
            assert false;
    }
    // make sure we are on the right side of the material
    if (Vector3.dot(state.getNormal(), state.getRay().getDirection()) > 0) {
        state.getNormal().negate();
        state.getGeoNormal().negate();
    }
    state.storePhoton(state.getRay().getDirection(), power, kd);
    double avg = kd.getAverage();
    double rnd = state.getRandom(0, 0, 1);
    if (rnd < avg) {
        // photon is scattered
        power.mul(kd).mul(1 / (float) avg);
        OrthoNormalBasis onb = OrthoNormalBasis.makeFromW(state.getNormal());
        double u = 2 * Math.PI * rnd / avg;
        double v = state.getRandom(0, 1, 1);
        float s = (float) Math.sqrt(v);
        float s1 = (float) Math.sqrt(1.0 - v);
        Vector3 w = new Vector3((float) Math.cos(u) * s, (float) Math.sin(u) * s, s1);
        w = onb.transform(w, new Vector3());
        state.traceDiffusePhoton(new Ray(state.getPoint(), w), power);
    }
}