Hi guys,
--- Operating System, Graphics card ---
Ubuntu 64, 16gbm RAM, 2 GTX 560TI OC
--- Blender version with error, and version that worked ---
All tested versions had the error, current svn too
--- Short description of error ---
Add a cube and a displacement modifier on it. Click on new texture to add an displacement tex, then subdivide the cube 2 times. The displacement modifier does not seem to be in effect. But when you change the size on the texture (smaller or bigger) the modifier is working as expected.
--- Steps for others to reproduce the error (preferably based on attached .blend file) ---
Just look at the supplied blend and play with the tex size. You'll notice that on 0.25 it seems nothing is being done, any other value is working.
Greetings, Thomas
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This is an unexpected side effect but it's not a bug as far as I can tell. The perlin noise texture has a pattern where at the locations of these vertices its values are all 0.5. Even if you add more subdivisions you can see that those vertices will not be displaced because of this.
The texture implementation could be changed so that this is less likely to occur, but that would mean breaking compatibility which we don't want to do here.