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

Example 6 with Color

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

the class Hair method getRadiance.

@Override
public Color getRadiance(ShadingState state) {
    // don't use these - gather lights for sphere of directions
    // gather lights
    state.initLightSamples();
    state.initCausticSamples();
    Vector3 v = state.getRay().getDirection();
    v.negate();
    Vector3 h = new Vector3();
    Vector3 t = state.getBasis().transform(new Vector3(0, 1, 0));
    Color diff = Color.black();
    Color spec = Color.black();
    for (LightSample ls : state) {
        Vector3 l = ls.getShadowRay().getDirection();
        float dotTL = Vector3.dot(t, l);
        float sinTL = (float) Math.sqrt(1 - dotTL * dotTL);
        // float dotVL = Vector3.dot(v, l);
        diff.madd(sinTL, ls.getDiffuseRadiance());
        Vector3.add(v, l, h);
        h.normalize();
        float dotTH = Vector3.dot(t, h);
        float sinTH = (float) Math.sqrt(1 - dotTH * dotTH);
        float s = (float) Math.pow(sinTH, 10.0f);
        spec.madd(s, ls.getSpecularRadiance());
    }
    Color c = Color.add(diff, spec, new Color());
    // transparency
    return Color.blend(c, state.traceTransparency(), state.getV(), new Color());
}

Example 7 with Color

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

the class AmbientOcclusionGIEngine method getIrradiance.

@Override
public Color getIrradiance(ShadingState state, Color diffuseReflectance) {
    OrthoNormalBasis onb = state.getBasis();
    Vector3 w = new Vector3();
    Color result = Color.black();
    for (int i = 0; i < samples; i++) {
        float xi = (float) state.getRandom(i, 0, samples);
        float xj = (float) state.getRandom(i, 1, samples);
        float phi = (float) (2 * Math.PI * xi);
        float cosPhi = (float) Math.cos(phi);
        float sinPhi = (float) Math.sin(phi);
        float sinTheta = (float) Math.sqrt(xj);
        float cosTheta = (float) Math.sqrt(1.0f - xj);
        w.x = cosPhi * sinTheta;
        w.y = sinPhi * sinTheta;
        w.z = cosTheta;
        onb.transform(w);
        Ray r = new Ray(state.getPoint(), w);
        r.setMax(maxDist);
        result.add(Color.blend(bright, dark, state.traceShadow(r)));
    }
    return result.mul((float) Math.PI / samples);
}

Example 8 with Color

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

the class ImageBasedLight method getSamples.

public void getSamples(ShadingState state) {
    if (samples == null) {
        int n = state.getDiffuseDepth() > 0 ? 1 : numSamples;
        for (int i = 0; i < n; i++) {
            // random offset on unit square, we use the infinite version of
            // getRandom because the light sampling is adaptive
            double randX = state.getRandom(i, 0, n);
            double randY = state.getRandom(i, 1, n);
            int x = 0;
            while (randX >= colHistogram[x] && x < colHistogram.length - 1) {
                x++;
            }
            float[] rowHistogram = imageHistogram[x];
            int y = 0;
            while (randY >= rowHistogram[y] && y < rowHistogram.length - 1) {
                y++;
            }
            // sample from (x, y)
            float u = (float) ((x == 0) ? (randX / colHistogram[0]) : ((randX - colHistogram[x - 1]) / (colHistogram[x] - colHistogram[x - 1])));
            float v = (float) ((y == 0) ? (randY / rowHistogram[0]) : ((randY - rowHistogram[y - 1]) / (rowHistogram[y] - rowHistogram[y - 1])));
            float px = ((x == 0) ? colHistogram[0] : (colHistogram[x] - colHistogram[x - 1]));
            float py = ((y == 0) ? rowHistogram[0] : (rowHistogram[y] - rowHistogram[y - 1]));
            float su = (x + u) / colHistogram.length;
            float sv = (y + v) / rowHistogram.length;
            float invP = (float) Math.sin(sv * Math.PI) * jacobian / (n * px * py);
            Vector3 dir = getDirection(su, sv);
            basis.transform(dir);
            if (Vector3.dot(dir, state.getGeoNormal()) > 0) {
                LightSample dest = new LightSample();
                dest.setShadowRay(new Ray(state.getPoint(), dir));
                dest.getShadowRay().setMax(Float.MAX_VALUE);
                Color radiance = texture.getPixel(su, sv);
                dest.setRadiance(radiance, radiance);
                dest.getDiffuseRadiance().mul(invP);
                dest.getSpecularRadiance().mul(invP);
                dest.traceShadow(state);
                state.addSample(dest);
            }
        }
    } else {
        if (state.getDiffuseDepth() > 0) {
            for (int i = 0; i < numLowSamples; i++) {
                if (Vector3.dot(lowSamples[i], state.getGeoNormal()) > 0 && Vector3.dot(lowSamples[i], state.getNormal()) > 0) {
                    LightSample dest = new LightSample();
                    dest.setShadowRay(new Ray(state.getPoint(), lowSamples[i]));
                    dest.getShadowRay().setMax(Float.MAX_VALUE);
                    dest.setRadiance(lowColors[i], lowColors[i]);
                    dest.traceShadow(state);
                    state.addSample(dest);
                }
            }
        } else {
            for (int i = 0; i < numSamples; i++) {
                if (Vector3.dot(samples[i], state.getGeoNormal()) > 0 && Vector3.dot(samples[i], state.getNormal()) > 0) {
                    LightSample dest = new LightSample();
                    dest.setShadowRay(new Ray(state.getPoint(), samples[i]));
                    dest.getShadowRay().setMax(Float.MAX_VALUE);
                    dest.setRadiance(colors[i], colors[i]);
                    dest.traceShadow(state);
                    state.addSample(dest);
                }
            }
        }
    }
}

Example 9 with Color

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

the class ShadingState method diffuse.

/**
 * Computes a plain diffuse response to the current light samples and global
 * illumination.
 *
 * @param diff diffuse color
 * @return shaded result
 */
public final Color diffuse(Color diff) {
    // integrate a diffuse function
    Color lr = Color.black();
    if (diff.isBlack()) {
        return lr;
    }
    for (LightSample sample : this) {
        lr.madd(sample.dot(n), sample.getDiffuseRadiance());
    }
    lr.add(getIrradiance(diff));
    return lr.mul(diff).mul(1.0f / (float) Math.PI);
}

Example 10 with Color

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

the class LightServer method getRadiance.

ShadingState getRadiance(float rx, float ry, float time, int i, int d, Ray r, IntersectionState istate, ShadingCache cache) {
    // set this value once - will stay constant for the entire ray-tree
    istate.time = time;
    scene.trace(r, istate);
    if (istate.hit()) {
        ShadingState state = ShadingState.createState(istate, rx, ry, time, r, i, d, this);
        state.getInstance().prepareShadingState(state);
        Shader shader = getShader(state);
        if (shader == null) {
            state.setResult(Color.BLACK);
            return state;
        }
        if (cache != null) {
            Color c = cache.lookup(state, shader);
            if (c != null) {
                state.setResult(c);
                return state;
            }
        }
        state.setResult(shader.getRadiance(state));
        if (cache != null) {
            cache.add(state, shader, state.getResult());
        }
        checkNanInf(state.getResult());
        return state;
    } else {
        return null;
    }
}