VR image - how do i fix these artifacts?

[paulison]

Hi Everyone,

Im working on this VR scene and aside from obvious problems such as the sun being too bright and the interior too dark, there are two main questions I have about artifacts on the image:

1. how do you prevent getting the divisions between the 6 frames of the VR? I can see the lines of the squares running through the image - it does this with both lightmap and QMC. I assume this is due to slight differences in lighting between each side of the cube - untick randomise samples?

2. why am i getting lots of artifacts on the wall? Im guessing because my lamps objects normals arnt correct? (modelling in ArchiCAD)

If anyone knows of any secret magic tickboxes that may solve these issues please let me know (even if its a guess because ill try it out). Yes, I do realise there is no button to "unshit" a scene but there should be one! This was never modelled for rendering in vray originally, but I copied the geometry to another scene which rendered perfectly so i'd have the same materials/settings just to see how it went.

Anyway, thanks in advance!

[paulison]

im re-rendering with these changes:

1. all glass and self illuminated objects have generate/receive caustics unticked in vray - system - objects settings

2. secondary ray bias changed back from 0.001 to 0

I'll post again if this solves my problems. If i figure this out hopefully it may help others with similar issues

this was still rendering with 1.47.10 (not brave enough for 12 yet)

[DanielBrew]

Hi Paul,

I'm guessing you've used Max/Viz's Panorama Exporter to create this image and that is where the lines between frames have come from. If you want to get rid of the lines you can get VRay to render a spherically mapped image (like the one above) in one go then convert the image to QTVR.

Go to Vray Camera, change the type to 'spherical', check 'Override FOV' and change FOV to 360. You also need to change the aspect ratio of your rendering to 2:1. Finally, hit render.

I use a freeware tool called PanoCube to convert these images into Quicktime movies, you should be able to find this on the web. One advantage in producing Quicktime VRs this way is you can use backburner to net render the images. The standard panorama exporter does not allow network rendering.

Hope this helps,

Dan

[paulison]

thanks Dan, thats heaps better!

i still cant fully get rid of the blotches but by lowering the light multiplier of the light in the corner and raising the GI minimum samples it has almost gone now. Maybee it also had something to do with not enough light because I've increased the multiplier on the sphere lights and thats helped a lot.

I know its not a great scene but it was set up quickly from an old 3d model (done in archicad) with the settings and materials saved from another job. I'm finding this speeds things up a lot!

[DanielBrew]

No problem, glad it worked for you.