@Test
public void testNormalize() {
Vector4 x = new Vector4(3, 4, 5, 6);
Vector4 y = x.normalize();
doAssertDouble(0.323, y.x);
doAssertDouble(0.431, y.y);
doAssertDouble(1, y.length());
}
/**
* Call the shader to determine the color a the point of intersection determined by the ray and
* parameter minT
*
* @param ray ray that determines the point
* @param minT value of parameter t
* @return Colour determined by the shader for this point
*/
public Colour callShader(Ray ray, double minT) {
Point point = ray.evaluate(minT);
Vector4 normal = new Vector4(center, point);
normal.normalize();
return Shader.computeColor(point, normal, material);
}
/**
* Returns the normal of the sphere at point p. Point p is assumed to be at the surface of the
* sphere
*
* @param p point at the surface
* @return normal at point p
*/
public Vector4 computeNormal(Point p) {
Vector4 normal = new Vector4(center, p);
normal.normalize();
return normal;
}
