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displacement map bug?

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christian kimdisplacement map bug?
by on Aug 29, 2010 at 8:16:02 am

Hi everyone, i am running into odd behaviour from displacement map.

basically, i have made a black and white animation to use as displacement map. and black is total black R0G0B0.

when i use displacement map effect using the map, the layer will "shift". i think basically whats happening is that, even though the displacement map is currently black, 50% displacement is still applied.

my understanding would be that black means no displacement, white would be full displacement. basically as soon as i apply displacement map effect, the whole layer will just shift by half the displacement.

i have looked up google and creativecow, but no luck.

anybody else run into this problem as well??

thanks so much in advance for any insight

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Matthew KeaneRe: displacement map bug?
by on Aug 29, 2010 at 10:53:10 am


If I recall, mid-grey pixels should result in no change, while white and black will give the maximum displacement in opposite directions. So, for a horizontal displacement, black (0) would give the maximum shift to the left, and white (255) the maximum shift to the right, while any mid-grey (127) pixels won't create any displacement.

To be honest though, I can never remember for certain whether it's white or black which gives the negative displacement, so you should probably go look this up!

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christian kimRe: displacement map bug?
by on Aug 30, 2010 at 12:49:05 am

Thanks matthew!

you are right, i actually figured it out last night after posting here.
was going to remove the post but since i am a new memeber, it took a while for this post to come alive, and it sliped my mind.

you are right about the mid grey being "0" transform.

i am coming from 3d animation packages, and usually white is "0", got me confused.

anyway! hope this post helps other users who might have same question.

thanks again Matthew!

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