Vertex Displacement

The Shaded Material patch

Quote:

Produces a shaded image from a height field. The height field is defined to have greater heights with lighter shades, and lesser heights (lower areas) with darker shades. You can combine this filter with the CIHeightFieldFromMask filter to produce quick shadings of masks, such as text.

The resulting image can be used as a backdrop, texture, illustration, whatever.

I have found no CIHeightFieldFromMask filter anywhere :-).

That apart, this patch does a pretty tidy job and has huge scaling range on the shadings produced. I like it. I have found though that it sometimes acts up under certain construct conditions.

These always include that the image being presented to the patch are resized and that size is congruent with the size of any image input into the OpenCL kernel routine creating one part of the two image inputs into the Shaded Material patch.

However, these same conditions also apply within those constructs that work without fail. The more that the noise texture image being used changes, say through a multiplex or a movie, the more likely the snarl up is with the Shaded Material patch.

Just wondered if anyone else had found this a useful patch and if they had any insight as to why it can seemingly unpredictable, cause a graphics related crash. It's as id the resize doesn't actually stick and causes a leak. No OpenCL leaking, just mentioned as being part of the construct.