How to compute texture coordinates?

Hi!

Given a triangle with its vertices and the texture coordinates at each vertex known, is there anyway of finding the texture coordinates of a point on that triangle?

pls help................

[DaViper]

What do you mean by


texture coordinates of a point on that triangle

if there is a point which falls within this triangle, is it possible to obtain the texture coordinates of this particular point?

[DaViper]

hmmm ok i think it should be possible,
your 3 triangle vertices are v1,v2,v3, your new point is p and your tex-coordinates are t1,t2,t3 (as glTexCoord2*) and your new tex coord is tp
now you can setup to equations in vector notation
|v1-v2|/|v1-p|=|t1-t2|/|t1-tp|
|v1-v3|/|v1-p|=|t1-t3|/|t1-tp|

with |v1-v2|=sqrt((x1-x2)*(x1-x2)+(y1-y2)*(y1-y2)+(z1-z2)*(z1-z2))
.
.
and
|t1-t2|=sqrt((t1-t2)*(t1-t2)+(s1-s2)*(s1-s2))

with that ist should be possible to solve those equations for your new tex coord.

hope that helps

[zed]

u want barycentric coordinate i think my friend