Generate (or Erase) Geometry Based On An Image

[Netvudu]

Hello,

what I

[aracid]

Hello,

what I

[symek]

Project texture, transfer colour to attribute, delete or modify based on this attribute. With some tweaking nice result can be achieved.

hope this help,

sy.

[Netvudu]

thanks both. I

[Netvudu]

Ok, the tracer sop even if a cool node is not useable for me at this point as it just generates geometry anywhere which isn

[symek]

See help for pic and tex expression

(type in texport:

>> exhelp tex

)

[Netvudu]

I see. Can

[symek]

Sorry, perhaps I'm a confusion man .

Actually you can do it with at least three ways:

- attribCreate SOP (as you said),

- pointSOP (as you said)

and

- VopSOP (best, easiest, fastest)

The third method is fastest because it uses VEX, which is many times faster then expressions like pic or tex.

hope this help,

sy.

Transfer_Colour.hipnc

[Netvudu]

A confusion man? no way! the example file was wonderful! I perfectly understood your three examples, even the VEX one which usually is all greek to me.

Now, I was able to replicate them in my scene, but I

[stevenong]

When you already have UVs, replace $BBX, $BBY and/or $BBZ with $MAPU, $MAPV and/or $MAPW.

Cheers!

steven

[symek]

Sorry, I completely forgot that it's all about Camera projection. I used bounding box to show how NOT to use UV, but of course if your geo has a UV you should use as Steven said (thank you Steven) $MAPUV or use Shading Layer Parameter VOP inside VOPs to read UV there.

cheers,

sy.

Edited December 12, 2007 by SYmek

[Netvudu]

It works! it works!...if according to SideFX I