VolumeRendering
3D Texturing Example
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3D texture is supposed to be given as texture object with id texid.
// global settings
glTexEnvi(GL_TEXTURE_ENV,GL_TEXTURE_ENV_MODE,GL_MODULATE);
glEnable(GL_TEXTURE_3D);
// bind specific texture
glBindTexture(GL_TEXTURE_3D,texid);
// render textured geometry
glMatrixMode(GL_TEXTURE);
glLoadIdentity();
glTranslated(0.5,0.5,0.5);
glMatrixMode(GL_MODELVIEW);
glBegin(GL_QUADS);
glTexCoord3f(x_0,y_0,z_0);
glVertex3d(x_0,y_0,z_0);
glTexCoord3f(x_1,y_1,z_1);
glVertex3d(x_1,y_1,z_1);
glTexCoord3f(x_2,y_2,z_2);
glVertex3d(x_2,y_2,z_2);
glTexCoord3f(x_3,y_3,z_3);
glVertex3d(x_3,y_3,z_3);
glEnd();
// unbind texture
glBindTexture(GL_TEXTURE_3D,0);
glDisable(GL_TEXTURE_3D);
glTexEnvi(GL_TEXTURE_ENV,GL_TEXTURE_ENV_MODE,GL_MODULATE);
glEnable(GL_TEXTURE_3D);
// bind specific texture
glBindTexture(GL_TEXTURE_3D,texid);
// render textured geometry
glMatrixMode(GL_TEXTURE);
glLoadIdentity();
glTranslated(0.5,0.5,0.5);
glMatrixMode(GL_MODELVIEW);
glBegin(GL_QUADS);
glTexCoord3f(x_0,y_0,z_0);
glVertex3d(x_0,y_0,z_0);
glTexCoord3f(x_1,y_1,z_1);
glVertex3d(x_1,y_1,z_1);
glTexCoord3f(x_2,y_2,z_2);
glVertex3d(x_2,y_2,z_2);
glTexCoord3f(x_3,y_3,z_3);
glVertex3d(x_3,y_3,z_3);
glEnd();
// unbind texture
glBindTexture(GL_TEXTURE_3D,0);
glDisable(GL_TEXTURE_3D);
Let $y_0, y_1, y_2, y_3$ be the height h of a horizontal slice.
For h = $-\frac14$, $0$, $+\frac14$ the result looks like this:
Q What vertices and texture coordinates are needed for vertical slices?
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