Texture a point defined by GL_POINTS

FlemTeam · January 23, 2002, 11:29am

Hello !

I am using GL_POINTS to create some dot everywhere on my screen, and now I would like to apply a texture on my points (I made them big with glSizePoint(64)

The problem is that I can’t set the mapping coordinate to this point… so I just have 1 color on my whole point…

Any idea ?

Leyder_Dylan · January 23, 2002, 11:45am

Oh my god, I don’t think that you can texture a point.

FlemTeam · January 23, 2002, 12:09pm

… In D3D it’s easy… I can’t beleive I can’t in OpenGL !

zeraiam · January 23, 2002, 12:12pm

It seems that you will have to make billboarded (allways facing camera) quads to use texturing.

FlemTeam · January 23, 2002, 12:22pm

I see…

Is there any option to get a billboarded quad or should I always use a transformation to re-orient this quad ?

zeraiam · January 23, 2002, 12:27pm

You’ll have to calculate the right transformation at each frame I’m afraid. But you can find many resources on the web about billboarding.

FlemTeam · January 23, 2002, 12:29pm

I found some documentation about the subject. so it is a library… But I prefer doing it by myself. Thank you for your help !

endo · January 23, 2002, 2:10pm

I thought you could texture map any primitive? Is this true?

imported_tfpsly · January 23, 2002, 7:41pm

I think there is an NVidia extension for this