Point Sprites
Subject : Point Sprites From: "Wesley Smith" <email@hidden >
Date: Wed, 16 May 2007 20:35:06 -0700
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Hi,
I'm on OSX 10.4.8 and trying to get point sprites to work. I'm not
seeing any attenuation in size in the sprites. All I get is
GL_POINT_SIZE_MIN_ARB for all points. Here's the code. Is there
something I'm forgetting? thanks,
wes glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluPerspective(45., aspect, 0.2, 100);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity(); glTranslatef(0.0, 0.0, -10.);
glRotatef(-0., 1.0, 0.0, 0.0); glEnable(GL_POINT_SPRITE);
glEnable( GL_BLEND );
glBlendFunc( GL_SRC_ALPHA, GL_ONE );
glPointSize(100.);
glPointParameterfARB( GL_POINT_FADE_THRESHOLD_SIZE_ARB, 60.0f );
glPointParameterf(GL_POINT_SIZE_MIN_ARB, 1);
glPointParameterf(GL_POINT_SIZE_MAX_ARB, 100);
glPointSize(100);
float quadratic[] = { 1.0f, 0.0f, 0.01f };
glPointParameterfvARB( GL_POINT_DISTANCE_ATTENUATION_ARB, quadratic );
;
glBegin(GL_POINTS);
glColor4f(1., 1., 1., 1.);
for(int j=0; j < data_height; j++) {
for(int i=0; i < data_width; i++) {
glVertex3fv(data + 3*(j*data_width + i)); //a cone
}
}
glEnd();
glDisable(GL_POINT_SPRITE_ARB);
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