colorpicker with uv coordinates

[hondo3000]

i thought it would be easy to figure out how a colorpicker for textures could
be done. but i run into a problem!

i made a cube and generated for each face a random texture using imaging
lingo. than mapped the textures on the cube. now i want to click on the cube
and get the color from the texture.

to do this i use modelsunderloc, this gives the uv coordinates of the polygon.
with this uv coordianates i thought it would be easy to project them on the
image and read the color with getpixel.

this works with all polygones that have a faceID of 2, faces with faceID 1
will give you strange values for the uv coordinates.

here is a online demo:
[url]http://kisd.de/~lutz/crap/color/colorpicker3D.zip[/url]

i tried this now for some hours and i am not sure how to fix this problem, so
please help me with this problem.

regards!

[JB]

Here are some references

[url]http://steel.lcc.gatech.edu/~dmccolgin/texture2.html[/url]

[url]http://www.directorforum.de/showthread.php?p=78237[/url]


Unfortunately the tidy ready made utility script I fould before didn't
surface on the web, with enough clever picking you should be able to
turn up some better examples.

[hondo3000]

thanks for the links, did not find them on my own...

but now i got the colorpicker to work, trick is to use the
texturecoordinatelist together with the points of the face to calculate the
point on the image of the texture. so a meshdeform modifier has to be used.

but if someone is interesting in looking at the code, here is the version that
works:
[url]http://kisd.de/~lutz/crap/color/sphere[/url]

and thanks again for the links!