texture to vertex color

[zveris]

is there a simple way to convert texture to vertex color in houdini? and as we are at that, is there any simple way to select vertex by color?

thanks in advance

[crunch]

Do you mean texture coordinates or texture color?

If you mean texture coordinates, you could plunk down a point SOP and turn on add color, then stick: $MAPU, $MAPV, $MAPW into the fields for color.

You can also copy the point colors to any other attribute. For example, the position. This would basically move the points of your model into the RGB color cube.

[plan9]

or use pic(), you can put this in the color parameters of a point SOP, or displace by adding it to the normal parameters. also, you can select points based on value, but couldnt tell ya the spell off the top of my nugget.

type: exhelp pic

float pic (string copname, float U, float V, float color_type)

This function will lookup a single pixel from a COP and return the color

of the pixel. The color_type parameter can be one of the following:

D_CR, D_CG, D_CB, D_CA, D_CHUE, D_CSAT, D_CVAL, D_CLUM

for the red, green, blue, alpha, hue, saturation, value, or luminance of

the pixel. The color returned will be interpolated smoothly between

adjacent pixels.

eg. pic("/comp/ice1/color1", .5, .5, D_CLUM)

See also: picni, tex, texni, res

good luck

[sirogi]

....and once you color your vertices the way plan9 is suggesting, selecting vertices by color is as simple as plopping down a Group SOP and selecting by expression

($CR<0.2 for example... etc...)

[zveris]

thx guys for help, trying it now.