I would also use quads. If you need screen-aligned billboards, you
can use the rows of the model-view matrix (assuming scale is 1) as the
basis for drawing the quad. For example:
//screen-aligned axes
vec3 axis1 = vec3( gl_ModelViewMatrix[0][0],
gl_ModelViewMatrix[1][0],
gl_ModelViewMatrix[2][0]);
vec3 axis2 = vec3( gl_ModelViewMatrix[0][1],
gl_ModelViewMatrix[1][1],
gl_ModelViewMatrix[2][1]);
wes
On Fri, May 30, 2008 at 8:39 AM, Kent Miller <email@hidden> wrote:
Point sprites do this.
I would just look at using quads. I don't think there is much advantage
to
point sprites unless you are doing something like a particle system with
thousands of points in which case point sprites can take your vertex data
rate down. GL Points have their own special set of quirks.
Kent
On May 30, 2008, at 8:30 AM, Mike wrote:
I am mapping texture to GL_POINT.
My point size varies but lets say it's 5x5 pixels. Currently the whole
point just samples single pixel from texture and point's texels are all
that
same color.
How can I (or can I) map it so that it all texels in point are sampled
(1:1) from texture? i.e. if texture is 100 x 100px and point is 25x25px
(not smoothed) the point should represent 1/4 region of texture and with
4
points I could represent whole texture.
Thanks.
-Mike
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