Vray 2.0 : Strange Lightcache behaviour with adaptive tracing

[racoonart]

I found a strange thing happening while rendering lightcache with adaptive tracing.
It only happens if adaptive tracing is switched on, see images below.
First rendering is without region rendering but you already see thin line of less dense sampling, second rendering is with region rendering, third after changing the region. So it just happens on random locations.

[vlado]

Thanks for the pointer, will check it out. Out of curiosity, have you seen advantages from the adaptive sampling?

Best regards,
Vlado

[racoonart]

Do you mean advantages since 1.5sp5 or advantages in a more common sense (like compared to lightcache without adaptive tracing) ?

By the way, i just found two other things which do not seem to be right:
1. If you copy the VRay VFB the SRGB switch is not taken into account. So the copied image is darker (without gamma applied).
2. In the Vray Light Lister, Caustics subdivs are shown for VrayLights but not for Standard lights like direct lights etc

[edit] and another thing:
3. when i have a refractive material with a bumpmap applied and switch Dispersion on, the bumpmap will not be rendered

[vlado]

Do you mean advantages since 1.5sp5 or advantages in a more common sense (like compared to lightcache without adaptive tracing) ?

I meant in general, yes.

1. If you copy the VRay VFB the SRGB switch is not taken into account. So the copied image is darker (without gamma applied).

Hm, it has always been like this I think.

2. In the Vray Light Lister, Caustics subdivs are shown for VrayLights but not for Standard lights like direct lights etc

Ah, thanks for the pointer. Will see if we can add them.

Best regards,
Vlado

[racoonart]

Just to be sure, did you see the thing I added?
" [edit] and another thing:
3. when i have a refractive material with a bumpmap applied and switch Dispersion on, the bumpmap will not be rendered "

I meant in general, yes.

In the Scene you see above i noticed a better contrast and less diffuse lightcache. I think it really adds to the overall look, but i can't tell yet how good or bad it works in animations because I didn't use it before, first time now. I just saw it in the manuals and wanted to try what it's doing.

1. If you copy the VRay VFB the SRGB switch is not taken into account. So the copied image is darker (without gamma applied).
>>Hm, it has always been like this I think.

I thought direct copying (strg+c) of the framebuffer's content is a new feature of vray 2.0 ? If so it would definitely help, cause it's not making much sense to copy a image with 8bit which doesn't have gamma applied.

[vlado]

3. when i have a refractive material with a bumpmap applied and switch Dispersion on, the bumpmap will not be rendered

Ok, will check it out.

I thought direct copying (strg+c) of the framebuffer's content is a new feature of vray 2.0 ? If so it would definitely help, cause it's not making much sense to copy a image with 8bit which doesn't have gamma applied.

Ah yes, you are right of course. I thought you meant cloning to the 3ds Max frame buffer. Will change this.

Best regards,
Vlado

[racoonart]

and another thing :
when i turn on the VFB history switch and use 2 rendered images to compare, I'm not able to turn it off again. The white slider will stay on screen even if i turn off the "show vfb history window" or try to deactivate the A/B buttons. I can't deactivate all three, one of them will still be turned on. Furthermore, while moving the slider forwards and backwards my region rendering box will change, that's kind of impractical.

[vlado]

Just select one of the thumbnails, f.e. the one marked "A", and click on the "Set A" button. This will unmark the thumbnail and restore the original contents of the VFB.

Best regards,
Vlado

[racoonart]

There are some other really weird things going on here...
1. If I want to reset some material editor slots (by pressing the "Reset map/mtl to default settings") button it just clears some map slots and the connection to scene objects, but the material will remain in the slot.
2. I just made some tests with the VrayDisplacement modifier and had some problems which i can't reproduce in a fresh scene. I have a VrayLight but it won't show up in the Vray Lighting renderelement - it's just black - but Lighting AND GI will both be in the GI renderelement. Furthermore I randomly have some strange artifacts in my displacement (see image below)

ok, very very strange... just reloaded the scene and now lighting + GI is in the VrayLighting renderelement and GI element is the same but a bit brighter.

[simmsimaging]

Hm, it has always been like this I think.
Ah, thanks for the pointer. Will see if we can add them.

Best regards,
Vlado

I was noticing today that the Vray light lister did not account for changes in the caustic subdivisions when I changed them through the properties. It just showed 1500 no matter what value I set by hand.

b

[vlado]

Yep, you might need to re-open the light lister for the changes to show up. It's not very easy to make the update automatic (as the caustic subdivs are somewhat different from the other light parameters).

Best regards,
Vlado

[racoonart]

There are some other really weird things going on here...
1. If I want to reset some material editor slots (by pressing the "Reset map/mtl to default settings") button it just clears some map slots and the connection to scene objects, but the material will remain in the slot.
2. I just made some tests with the VrayDisplacement modifier and had some problems which i can't reproduce in a fresh scene. I have a VrayLight but it won't show up in the Vray Lighting renderelement - it's just black - but Lighting AND GI will both be in the GI renderelement. Furthermore I randomly have some strange artifacts in my displacement (see image below)

ok, very very strange... just reloaded the scene and now lighting + GI is in the VrayLighting renderelement and GI element is the same but a bit brighter.

[ATTACH=CONFIG]5313[/ATTACH]

@Vlado: Can you say something concerning these Issues? I had different effects like these in different situations...

[vlado]

1. If I want to reset some material editor slots (by pressing the "Reset map/mtl to default settings") button it just clears some map slots and the connection to scene objects, but the material will remain in the slot.

This is how it has always worked for me, in all V-Ray/3ds Max versions. The button just resets the settings of the current material to their default values and clears all textures. The material itself remains the same as such.

2. I just made some tests with the VrayDisplacement modifier and had some problems which i can't reproduce in a fresh scene. I have a VrayLight but it won't show up in the Vray Lighting renderelement - it's just black - but Lighting AND GI will both be in the GI renderelement. Furthermore I randomly have some strange artifacts in my displacement (see image below)

ok, very very strange... just reloaded the scene and now lighting + GI is in the VrayLighting renderelement and GI element is the same but a bit brighter.

Are you using the subdivision displacement method, or one of the other two modes (2d/3d displacement)?

Best regards,
Vlado

[racoonart]

To the first point: You're right! It always has been like that... O_o my fault, I could have sworn it would reset to max standard materials...

To the second: I've been using 3d mapping (cause it's much faster than normal subdivision). I did use 3 noise maps multiplied on top of each other to do the displacement.

But even if there is something wrong with displacement, the Renderelement thing is much worse :/

[olly]

Did this bug at the start of this thread ever get fixed?