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Fixed issue 833

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This commit is contained in:
codeanticode
2011-09-05 19:48:25 +00:00
parent 99e485ecf5
commit a130d6965f
1 changed files with 12 additions and 12 deletions
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24
java/libraries/opengl/src/processing/opengl/PGraphicsOpenGL.java
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@@ -5583,11 +5583,13 @@ return width * (1 + ox) / 2.0f;
lightSpecular[lightCount][1] = currentLightSpecular[1];
lightSpecular[lightCount][2] = currentLightSpecular[2];
lightSpecular[lightCount][3] = currentLightSpecular[3];
float invn = 1.0f / PApplet.dist(0, 0, 0, nx, ny, nz);
lightNormal[lightCount][0] = invn * nx;
lightNormal[lightCount][1] = invn * ny;
lightNormal[lightCount][2] = invn * nz;
// In this case, the normal is used to indicate the direction
// of the light, with the w component equals to zero. See
// the comments in the lightDirection() method.
lightNormal[lightCount][0] = -nx;
lightNormal[lightCount][1] = -ny;
lightNormal[lightCount][2] = -nz;
lightNormal[lightCount][3] = 0.0f;
lightEnable(lightCount);
@@ -5753,15 +5755,13 @@ return width * (1 + ox) / 2.0f;
}
protected void lightDirection(int num) {
if (lightType[num] == DIRECTIONAL) {
// TODO this expects a fourth arg that will be set to 1
// this is why lightBuffer is length 4,
// and the [3] element set to 1 in the constructor.
// however this may be a source of problems since
// it seems a bit "hack"
if (lightType[num] == DIRECTIONAL) {
// The w component of lightNormal[num] is zero, so the light is considered as
// a directional source because the position effectively becomes a direction
// in homogeneous coordinates:
// http://glprogramming.com/red/appendixf.html
gl2f.glLightfv(GL2.GL_LIGHT0 + num, GL2.GL_POSITION, lightNormal[num], 0);
} else { // spotlight
// this one only needs the 3 arg version
gl2f.glLightfv(GL2.GL_LIGHT0 + num, GL2.GL_SPOT_DIRECTION, lightNormal[num], 0);
}
}