Package org.boxutil.util.lut

Class ShadingLUT.KullaContyBRDF

java.lang.Object

org.boxutil.util.lut.ShadingLUT.KullaContyBRDF

Enclosing class:

ShadingLUT

public static final class ShadingLUT.KullaContyBRDF
extends Object

Method Summary

Modifier and Type	Method	Description
static int[]	genApproximation(boolean useTextureStorage)	OpenGL 3.0+
static int[]	genApproximation(int sampleNum, byte sizeExponent, boolean useTextureStorage, boolean bit16)	OpenGL 3.0+

Methods inherited from class java.lang.Object

clone, equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Details

genApproximation

public static int[] genApproximation(int sampleNum,
 byte sizeExponent,
 boolean useTextureStorage,
 boolean bit16)

OpenGL 3.0+

Real-time calculation.

For how to sample the value in shader:

 glsl:
 float EMuVOM = texture(emuTex, vec2(NdotV, roughness)).x; // 1.0 - EMu; sampler2D
 float EMuLOM = texture(emuTex, vec2(NdotL, roughness)).x; // 1.0 - EMu; sampler2D
 float EAvg = texture(eavgTex, roughness).x; // just EAvg; sampler1D
 
 

Returns:

int[] = {EMu, EAvg};

genApproximation

public static int[] genApproximation(boolean useTextureStorage)

OpenGL 3.0+

The Kulla-Conty Approximation 2D&1D texture, 64*64 / 64 half-float layout.

For how to sample the value in shader:

 glsl:
 float EMuVOM = texture(emuTex, vec2(NdotV, roughness)).x; // 1.0 - EMu; sampler2D
 float EMuLOM = texture(emuTex, vec2(NdotL, roughness)).x; // 1.0 - EMu; sampler2D
 float EAvg = texture(eavgTex, roughness).x; // just EAvg; sampler1D
 
 

Returns:

int[] = {EMu, EAvg};