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Index › Programming Questions & Help › OpenGL and 3D Libraries › OpenGL Primitives

zzzziesta YaBB Newbies Offline Posts: 4	OpenGL Primitives Jun 26th, 2008, 3:29pm   Hi, I am not very well versed in OpenGL. I would simply like to know how to draw simple primitives. For example how to draw a series of cones in 3D? In 'hacks' there is a section called 'More primitives'. Perhaps someone can post a few simple examples. It would be much appreciated. Thanks

JohnG Ex Member	Re: OpenGL Primitives Reply #1 - Jun 26th, 2008, 4:07pm   JOGL actually comes with a class of such things: com.sun.opengl.util.GLUT which has such functions as glutSolidCone(double base, double height, int slices, int stacks) to draw things. You'll have to wrap it in a beginGL()/engGL() pair though.

zzzziesta YaBB Newbies Offline Posts: 4	Re: OpenGL Primitives Reply #2 - Jun 26th, 2008, 4:44pm   Thanks for your help. I looked at the jogl documentation, and it seems that this function only allows you to draw a cone around the z axis? I need to specify a start and an end point in 3D and draw a cone of specific radius between them. Is it possible with that function?

zzzziesta YaBB Newbies Offline Posts: 4	Re: OpenGL Primitives Reply #3 - Jun 26th, 2008, 4:55pm   Or do I draw the Cone around the Z axis and then translate / rotate it? If so, how would I do that? A small bit of code perhaps, just to get me started? Thanks.

PhiLho  YaBB Moderator Offline Posts: 4190 Near Paris (France)	Re: OpenGL Primitives Reply #4 - Jun 28th, 2008, 11:21am   Out of curiosity, I just looked at the OpenGL examples in PDE. I should study them, I am also an OpenGL newbie. Anyway, the Shape Transform demo shows how to make a cone out of a pyramid with lot of sides... Not sure if it is good enough. There is also the surfaceLib, without cone primitive, but you can create it, apparently.