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package org.sunflow.core;
import org.sunflow.image.Color;
/**
* A shader represents a particular light-surface interaction.
*/
public interface Shader extends RenderObject {
/**
* Gets the radiance for a specified rendering state. When this method is
* called, you can assume that a hit has been registered in the state and
* that the hit surface information has been computed.
*
* @param state current render state
* @return color emitted or reflected by the shader
*/
public Color getRadiance(ShadingState state);
/**
* Scatter a photon with the specied power. Incoming photon direction is
* specified by the ray attached to the current render state. This method
* can safely do nothing if photon scattering is not supported or relevant
* for the shader type.
*
* @param state current state
* @param power power of the incoming photon.
*/
public void scatterPhoton(ShadingState state, Color power);
// EP : Added transparency management
/**
* Returns <code>true</code> if this shader is fully opaque.
* This gives a quick way to find out if a shader needs further processing
* when hit by a shadow ray.
*/
public boolean isOpaque();
/**
* Returns how much light is blocked by this shader.
*/
public Color getOpacity(ShadingState state);
// EP : End of modification
}
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