1 reply to this topic

[mike4]

Hi
I do:
for x < 128
for z < 128
returns a height map (y).
now I'd want to rotate (opengl glpoints glvertex2f) that with a given angle around the centre.
Any ideas/help?
Many thanks
Michael

[Tsus]

Hi!

Build the mesh exactly the way you have, but before the rendering of the mesh do:

Move the center of height map to (0,0,0).

glTranslatef(-64, 0, -64);

Rotate around the y-axis.

glRotatef(angleInDegree, 0,1,0);

Move back to the original position.

glTranslate(64, 0, 64);

Okay… and since we are in OpenGL land, you actually have to do it in the reverse order.

glTranslate(64, 0, 64);
glRotatef(angleInDegree, 0,1,0);
glTranslatef(-64, 0, -64);

(The matrices are pushed on a stack. What came last is executed first.)

Cheers!