MatX Furnace Test
1469 12 0- Danny McGrath
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I've set up a furnace test between Karma/MatX and Octane/Universal material, with varying results. The most disappointing for me is the all-important micro-surface test with normal map, which MatX didn't do very well on. All images have a default of Diffuse = 1/Spec = 1 - with additional channels added or removed as needed.
Baseline diffuse 1/spec 1 Note: we can see Karma MatX outline here in the base test.
Baseline diffuse 1/spec 1 Note: we can see Karma MatX outline here in the base test.
Edited by Danny McGrath - 2024年7月22日 09:31:13
- Danny McGrath
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- Danny McGrath
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- Danny McGrath
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- Danny McGrath
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- Danny McGrath
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- Danny McGrath
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- Danny McGrath
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- Danny McGrath
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Overall, I think MatX performed very poorly. This has been a known issue in Arnold for quite some time,due to Standard Surface Material leaking energy because of the lack of multiple scattering reflections and the use of classic normal mapping. These issues have possibly carried across to MaterialX? Even Blender at this stage has implemented multi-scatter GGX. Hopefully this will be improved in futures versions of MatX.
- Danny McGrath
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Currently, the Rombo 3rd-party Arnold material is the only model I know of that implements microfacet normal mapping, based on this paper. I expect Octane does too, based on the results above.
https://www.researchgate.net/publication/321233843_Microfacet-based_normal_mapping_for_robust_Monte_Carlo_path_tracing [www.researchgate.net]
https://www.researchgate.net/publication/321233843_Microfacet-based_normal_mapping_for_robust_Monte_Carlo_path_tracing [www.researchgate.net]
- Danny McGrath
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- Danny McGrath
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- Danny McGrath
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