rendering artifacts? - Polyloop

dooki · 10th February 2008, 06:43

Hey all,

Been a while using Carrara. Take a look at these images.

- I have artifacts (spots) on the surface of the cap.
- Another cap I just imported and it looks like a REALLY low polygon model.

The model is made in Rhino 4 and imported at .obj

THanks,
Dooki

Piem · 10th February 2008, 12:22

The tesselation options are very low. You'd better export as open nurbs and let Carrara do the job.

jbshorty · 10th February 2008, 14:03

Hi Dooky. As Piem mentioned, you might need to tesselate the mesh at higher density to avoid some of those artifacts. I much prefer to mesh my objects in Rhino, than to use Carrara's mesher. Rhino's mesher gives you much more control. If you are 100% happy with the object display in Rhino, then you can run "_ExtractRenderMesh" to grab the display mesh. Then export it using the OBJ exporter found in the Rhino Labs. The Labs exporter supports vertex normal smoothing. so your rendered object should appear exactly the same in Carrara as it does in Rhino... One more benefit to meshing your object in Rhino is that R4 polysurfaces now have "packed" textures by default. So when you mesh from Rhino, all the UV areas will be nested into one UV space. This means you can use a single texture map to shade your mesh. No UV work required. Or you can unpack them by running "_UnpackTextures" before meshing/extracting...

jonah

dooki · 11th February 2008, 00:20

Thanks guys! That helped.

-Dooki

10th February 2008, 06:43	#1 (permalink)
dooki Box modeling Join Date: Feb 2005 Location: Northern Calif. Posts: 268	rendering artifacts? Hey all, Been a while using Carrara. Take a look at these images. - I have artifacts (spots) on the surface of the cap. - Another cap I just imported and it looks like a REALLY low polygon model. The model is made in Rhino 4 and imported at .obj THanks, Dooki Attached Thumbnails __________________ PC/ P4/ /XP/ 2.4GHz/ 512RAM/ ATI Radeon 9550/256RAM Macbook Pro/Leopard/2.4GHz/4RAM/NVIDIA 8600M (256MB) eMac/ G4/Tiger/ 1.25 GHz/ 768RAM/ ATI Radeon 9200

11th February 2008, 00:20	#4 (permalink)
dooki Box modeling Join Date: Feb 2005 Location: Northern Calif. Posts: 268	Thanks guys! That helped. -Dooki __________________ PC/ P4/ /XP/ 2.4GHz/ 512RAM/ ATI Radeon 9550/256RAM Macbook Pro/Leopard/2.4GHz/4RAM/NVIDIA 8600M (256MB) eMac/ G4/Tiger/ 1.25 GHz/ 768RAM/ ATI Radeon 9200

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10th February 2008, 12:22	#2 (permalink)
Piem Booh! Join Date: May 2003 Location: Rennes/fr Posts: 6,605	The tesselation options are very low. You'd better export as open nurbs and let Carrara do the job.

10th February 2008, 14:03	#3 (permalink)
jbshorty proud to be a nurb Join Date: Jul 2006 Location: only in your mind Posts: 1,335	Hi Dooky. As Piem mentioned, you might need to tesselate the mesh at higher density to avoid some of those artifacts. I much prefer to mesh my objects in Rhino, than to use Carrara's mesher. Rhino's mesher gives you much more control. If you are 100% happy with the object display in Rhino, then you can run "_ExtractRenderMesh" to grab the display mesh. Then export it using the OBJ exporter found in the Rhino Labs. The Labs exporter supports vertex normal smoothing. so your rendered object should appear exactly the same in Carrara as it does in Rhino... One more benefit to meshing your object in Rhino is that R4 polysurfaces now have "packed" textures by default. So when you mesh from Rhino, all the UV areas will be nested into one UV space. This means you can use a single texture map to shade your mesh. No UV work required. Or you can unpack them by running "_UnpackTextures" before meshing/extracting... jonah