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Rendering with Arnold in CINEMA 4D using the C4DtoA plug-in.
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C4DtoA Displacement and mesh issue

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Message 1 of 4
jr_w
829 Views, 3 Replies

C4DtoA Displacement and mesh issue

Hi, i'm trying to apply a displacement material to an imported mesh object which is a simple box with rounded corners:

795-snapshot-24.png

The resulting rendering looks horrible:

796-snapshot-25.png

However, a bump map material has no problems:

797-snapshot-26.png

And the C4D material, although it also has problems with displacement, is a lot more evenly spread out than the Arnold displacement:

798-snapshot-27.png

As I understand, the Arnold displacement uses the tesselation of the mesh object to calculate the size and position of the displacement, whereas bump uses the UV of the mesh object. Is this correct? And if so, is there any way to achieve a decent displacement rendering with Arnold using this mesh object?

Thanks.

displacement-test.zip (mesh object)

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3 REPLIES 3
Message 2 of 4
Stephen.Blair
in reply to: jr_w

Displacement displaces vertices, so you need to subdivide (adaptive) or enable autobump.

autobump gives you the effect of displacement between existing vertices, so you don't have to subdivide as much.



// Stephen Blair
// Arnold Renderer Support
Message 3 of 4
jr_w
in reply to: jr_w

Thank you Stephen, now I understand the purpose of Auto bump. Setting it on solves the unevenness problem.

Subdivision type none:

800-snapshot-28.png

Subdivision type Catclark, iterations 0:

801-snapshot-29.png

Subdivision type Catclark, iterations 1:

802-snapshot-30.png

There are some streaks visible along the blend edges, the best seems to be the middle solution.

Message 4 of 4
jr_w
in reply to: jr_w

I've finally achieved a good result. In the network editor I had a 3D bump node which caused problems, so I removed that to get a simple noise > normal displacement > arnold displacement setup. Also, I ran the Optimize command on the mesh object, then generated a new UVW tag from a cubic projection, then set the noise space to UV.

Subdivision type Catclark, iterations 0, Auto bump on:

803-snapshot-32.png

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