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markdd

Displacement mapping giving strange results

Question

I posted something similar on the rendering part of these forums, but I have been investigating further.....

 

In the process of trying to understand the new Parallax bump map shader I ran into this peculiar problem with the displacement map shader. I made a brand new texture with a Renderworks brick png as a bump shader image.

Screen_Shot_2017-10-04_at_14_17_48.png.0cab110a6be21d12e02a2a3c55c3ed83.png

The First Column is an extruded rectangle. 

The second is a Nurbs Surface

The Third is the same Extruded rectangle converted to Nurbs Surfaces

The Fourth is a generic Solid made from the third column (using the stitch and trim command)

 

As you can see the 2nd and third are as you would expect a brick texture to look. The first though, and what led me to try and work out what was wrong in the first place, shows a very Low res pixelated/block like effect, with the mapping reversing itself half way down. The fourth  looks fine but is "vignetted" at the edges. Admittedly a really nice effect but not what I expected. I am assuming this is a bug in 2018.

 

I have enclosed the file so others can take a look and hopefully offer me some advice if I have done something stupid.

 

 

Untitled_1.vwx

Edited by markdd
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You have done nothing stupid, I filed this as a bug. I first noticed it when doing some tests on plastic siding. VB-143688

It seems to be semi related to camera position, i noticed it most obviously when i had a camera swoop by a wall with holes cut into it, it sort of rippled like weird amorphous water.
 

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I mean the location the view is currently located, not necessarily a Renderworks Camera object.

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1 hour ago, markdd said:

Admittedly a really nice effect but not what I expected.

 

Ha, isn't that always the case. It is a nice effect and something you couldn't recreate easily.

Kevin

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