portals & translucency

Corona Corona for 3ds Max Issues
1

Do not know this is a bug or a feature …
Portals reduce translucency effect from CoronaSky or HDRI!

Trans_portal.jpg
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2

And another feature or a bug?
Here no Corona Sun, only HDRI!

hdri_direct.jpg
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3

Try it with max sample intensity 0

4

Yes indeed, MSI strongly influences on the translucence.
And I think that it is still a feature of the portal, not a bug, right?

MSI_0_send.jpg
MSI_0_send.jpg767×652 45 KB

5

So the image looks different with MSI 0 and no portals? Do you use HD cache?

6

Yes, I use HD cache!
I again tested (with portals). The big difference in lighting!

msi.jpg
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7

I Tested in PT+PT mode rendering and again diffrence is big!
Well, I guess it’s okay, because at MSI = 0 samples are clamp.

PT_PT_msi.jpg
PT_PT_msi.jpg1085×461 148 KB

8

yes, there is supposed to be a difference between different MSI, but not between portals/no portals when rendering in unbiased mode (MSI 0, PT+PT)

9

You mean with MSI=10 samples are clamped? Setting MSI to 0 should introduce more noise, right?

10

I tested it too, the difference between the portals/no portals - no!

You mean with MSI=10 samples are clamped? Setting MSI to 0 should introduce more noise, right?

Yes and Yes!

11

no, 0 = infinity = no bias.

If there is no difference when using PT+PT MSI0, then it is not a bug, but I’ll have to set default MSI higher in future builds

12

And you can restore to default random sampler “Aplha 3 emu..” :)! According to my tests, it is better for light sampling.