"use lightcache for glossy ray" VS glossy refracti

V-Ray for 3ds Max V-Ray for 3ds Max :: Issues
1

Is there any way, or is it even possible to get decent render when using ‘use lightcache for glossy ray’ in conjunction with glossy refraction material?

I never had any problems when using only glossy reflection, but whenever I put just a little glossy refraction, the render would come out like this:


Shot at 2007-07-23

glass material is :
- Diffuse : black
- Reflect : 253,253,253. Glossy : 0.9
- Refract : 253,253,253. Glossy : 0.9

Irrmap : medium (-6,-1) hsph 50 ,interp 50
Lightcache : subdiv 500. Use lightcache for glossy ray is ON.

2

try to filter ur lc!
:wink:

3

You can also try to set the “Treat glossy rays as GI rays” in the options of the refractive material to “None” and see if it helps.

Best regards,
Vlado

4

tried using 100 interp samples, and prefilter… helped a bit. But artifact still persists

anyway, I think I’ve found a working solution… that is by unchecking the ‘store direct light’ in LC setting (default = on)

This is what i got for comparisons:

1. Use LC for glossy rays turned OFF:

2. Use LC for glossy rays turned ON, store direct light ON:

3. Use LC for glossy rays turned ON, store direct light OFF:

looking at the render times, and the not-so-visible quality difference, I’m really happy with the results :slight_smile:

one question: any side effect I should expect when ‘store direct light’ is turned OFF?

5

More precise GI and somewhat slower rendering.

Best regards,
Vlado

6

less accurate shadows…but in this case this is not visible

7

More accurate shadows in my experience, as the “store…” function basically bakes the direct light into the LC, and the quality is then dependent on LC settings as opposed to the light settings and qmc sampling.

Personally I never use “store…” as the quality is not good enough, and flickers\boils in animations.

8

yep!that sums it up :slight_smile:
Thanks trixian!

…time for a cofee…still sleepy! :lol: