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From Marco Jez, improvement to the handling of coordinates frame in CubeMapGenerator.

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This commit is contained in:
Robert Osfield
2003-08-21 09:51:25 +00:00
parent 1a68dd80d7
commit 7b9de3ad91
1 changed files with 22 additions and 21 deletions
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43
src/osgUtil/CubeMapGenerator.cpp
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@@ -13,6 +13,8 @@
#include <osgUtil/CubeMapGenerator>
#include <stdlib.h>
#include <osg/Matrix>
using namespace osgUtil;
CubeMapGenerator::CubeMapGenerator(int texture_size)
@@ -41,29 +43,28 @@ CubeMapGenerator::CubeMapGenerator(const CubeMapGenerator &copy, const osg::Copy
void CubeMapGenerator::generateMap(bool use_osg_system)
{
const float duv = 2.0f/(texture_size_-1);
osg::Matrix M;
if (use_osg_system) {
M = osg::Matrix::rotate(osg::PI_2, osg::Vec3(1, 0, 0));
} else {
M = osg::Matrix::identity();
}
const float dst = 2.0f/(texture_size_-1);
float v = 1;
float t = -1;
for (int i=0; i<texture_size_; ++i) {
float u = 1;
for (int j=0; j<texture_size_; ++j) {
if (use_osg_system) {
set_pixel(0, j, i, compute_color(osg::Vec3(1, -u, v)));
set_pixel(1, j, i, compute_color(osg::Vec3(-1, u, v)));
set_pixel(2, j, i, compute_color(osg::Vec3(-u, v, 1)));
set_pixel(3, j, i, compute_color(osg::Vec3(-u, -v, -1)));
set_pixel(4, j, i, compute_color(osg::Vec3(-u, -1, v)));
set_pixel(5, j, i, compute_color(osg::Vec3(u, 1, v)));
} else {
set_pixel(0, j, i, compute_color(osg::Vec3(1, v, -u)));
set_pixel(1, j, i, compute_color(osg::Vec3(-1, v, u)));
set_pixel(2, j, i, compute_color(osg::Vec3(-u, 1, v)));
set_pixel(3, j, i, compute_color(osg::Vec3(-u, -1, -v)));
set_pixel(4, j, i, compute_color(osg::Vec3(-u, v, -1)));
set_pixel(5, j, i, compute_color(osg::Vec3(u, v, 1)));
}
u -= duv;
float s = -1;
for (int j=0; j<texture_size_; ++j) {
set_pixel(0, j, i, compute_color(osg::Vec3(1, -t, -s) * M));
set_pixel(1, j, i, compute_color(osg::Vec3(-1, -t, s) * M));
set_pixel(2, j, i, compute_color(osg::Vec3(s, 1, t) * M));
set_pixel(3, j, i, compute_color(osg::Vec3(s, -1, -t) * M));
set_pixel(4, j, i, compute_color(osg::Vec3(s, -t, 1) * M));
set_pixel(5, j, i, compute_color(osg::Vec3(-s, -t, -1) * M));
s += dst;
}
v -= duv;
t += dst;
}
}