[Sidefx-houdini-list] Halo edge detect
malexander at sidefx.com
Fri Jan 13 10:55:50 EST 2006
Some operations don't scale as well, and while making parameter changes,
COPs uses 'Fast Interactive Cooking' which scales the image in the
viewport down by 4x to cook faster. A prewitt or sobel edge detect is a
3x3 kernel filter, which is difficult to approximate when using proxy
resolutions. The image is effectively blurred by 4 pixels when shrunk,
so your edges will be more subdued (and sometimes almost invisible if
they were faint at full res).
You can turn off fast interactive cooking in the viewport with the
hotkey 'f' (there is also a toggle button in the upper right, with an
icon of a mouse cursor & a watch). It's a handy toggle for when you need
to see the full-res results during interactive cooking.
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