Select primitives by alpha mask

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Hey guys,

Please help me figuring out how to select/remove polygons, or make a group based on the texture color.

Idea is I have a black and white alpha masl [farm3.static.flickr.com]. I need to select polygons in white color and remove them. Or assign a group to that area.

Thank you!
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Use ‘attribfrommap’ node to transfer color infos from texture to geo's Cd, then blast/group white area.

Attachments:
maskGeo.hipnc (194.2 KB)

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or trace>resample ?
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That is incredible, thank you so much!
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