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| Mental Ray Mental Images Mental Ray (Standalone & application integrated versions) |
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June 29th, 2008
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#1 (permalink) |
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Member
Join Date: Sep 2007
Location: Goteborg
Posts: 88
Name: Robert Karlsson  |
How did I break the "Fast Glossy Interpolation"?
I have this strange problem I can't figure out how to solve, other than doing a Reset. Some way I have disabled the blurry reflections made through "Fast (Interpolate")... they just render out like a perfect mirror - even though the glossiness is 0.5. I've ticked the checkbox, set it to lookup 3-5 points and form 1 to 1/5 of the resolution. The Glossy samples are left at 0, since I want it to render quickly.
If I disable Fast (Interpolate) and crank up the glossy samples, it renders nicely but takes a long time. After a File > Reset, it works the way I'm used to. What am I missing!? Robert |
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June 29th, 2008
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#2 (permalink) | |
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Senior Member
Join Date: Dec 2003
Location: SC, USA
Age: 38
Posts: 205
Name: Jeff Patton  |
Re: How did I break the "Fast Glossy Interpolation"?
Quote:
__________________
Jeff Patton My mental ray blog | Personal Website | mrmaterials.com Interested in mental ray for 3ds Max training? |
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June 29th, 2008
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#3 (permalink) |
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Member
Join Date: Sep 2007
Location: Goteborg
Posts: 88
Name: Robert Karlsson |
Re: How did I break the "Fast Glossy Interpolation"?
Hmmm... the Help files (Arch and design material chapter) claims that to obtain very fast rendering glossy reflections, "Glossy samples" can be left at 0 (true mirror) and yet the interpolation will create the impression of blurriness... or have I misunderstood something?
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June 29th, 2008
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#4 (permalink) | |
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Senior Member
Join Date: Dec 2003
Location: SC, USA
Age: 38
Posts: 205
Name: Jeff Patton |
Re: How did I break the "Fast Glossy Interpolation"?
Quote:
This is what the help file states on the subject: "For slightly blurry but also very weak reflections, you can “cheat” by applying a lower Reflection Glossiness value for broader highlights while setting Reflection Glossy Samples to 0. This shoots only one mirror ray for reflections, but if they are very weak, the viewer can often not really tell." -and- "Note: If you set Glossy Samples to 0, the reflections take the form of a “perfect mirror” and only one ray is shot, regardless of the actual value of Glossiness . You can use this to boost performance for surfaces with very weak reflections. The highlight still respects the Glossiness value." Therefore, if your lights are generating specular highlights (they do by default) those highlights will respect the glossiness values and spread out as you decrease the glossiness value. However, the 'actual' reflections will not blur. For stronger glossy reflections, you'll have to use samples regardless of whether you're using the interpolation method of calculation or not.
__________________
Jeff Patton My mental ray blog | Personal Website | mrmaterials.com Interested in mental ray for 3ds Max training? Last edited by pixelperfectg; June 29th, 2008 at 01:59 PM. |
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