Exemple #1
0
  /**
   * Shades a point with the same algorithm used by the {@link <a
   * href="http://surf.sourceforge.net">surf raytracer</a>}.
   *
   * @param hitPoint Intersection point.
   * @param v View vector (from intersection point to eye).
   * @param n Surface normal.
   * @param material Surface material.
   * @return
   */
  protected Color3f shadeWithMaterial(
      Point3d hitPoint,
      Vector3d v,
      Vector3d n,
      Color3f ambientColor,
      LightProducts[] lightProducts) {
    Vector3d l = new Vector3d();
    Vector3d h = new Vector3d();

    Color3f color = new Color3f(ambientColor);

    for (int i = 0; i < dcsd.lightSources.length; i++) {
      LightSource lightSource = dcsd.lightSources[i];

      l.sub(lightSource.getPosition(), hitPoint);
      l.normalize();

      float lambertTerm = (float) n.dot(l);
      if (lambertTerm > 0.0f) {
        // compute diffuse color component
        color.scaleAdd(lambertTerm, lightProducts[i].getDiffuseProduct(), color);

        // compute specular color component
        h.add(l, v);
        h.normalize();

        color.scaleAdd(
            (float)
                Math.pow(Math.max(0.0f, n.dot(h)), lightProducts[i].getMaterial().getShininess()),
            lightProducts[i].getSpecularProduct(),
            color);
      }
    }

    color.clampMax(1.0f);

    return color;
  }