Yes, I have been using IRmap (with LC for primary) for a long time now, and usually had good results. I am having a few problems with blotchiness with this scene though. If I use QMC/LC it looks better, but I need the settings pretty high to get rid of fine noise.
Here’s a screen grab of a render in progress:
And my settings are as follows:
Vray sunlight/skylight plus about 20 vraylights for the ceiling lights closer to the core of the building. The glowing Vraylightmtl I am using for the actual lights is set not to generate GI
Image Sampler: Adaptive DMC, min=1, max=16, Clr thresh=0.02
IR: Irmap=medium settings with 80 Subdivs and 20 Interpolation
LC: 1000 default settings (light cache NOT used for glossy rays)
DMC Sampler: Adaptive amount 1.0, Noise thresh=0.01, Min samples=5
(I think it may be these last settings that need work)
Its amazing how much I am still learning about Vray, and I’ve been using it for years now. Most of my work in the past has been with exterior shots so I think you can get away with knowing less about global illumination - stick a vraysun and vraysky in there and its great. Interiors call for a much deeper knowledge of vray and the recent online tutorial by cpnichols has been very useful indeed, but it creates pretty high rendertimes when using brute force/LC. I really want to get it working with Irmaps/LC but am often having these blotchy problems.
I have cahnged my DMC Sampler settings. I had adaptive set to 1.0 but I have put it to 085 now with Noise at 0.005 and min samples to 8. It seems a lot better - I think they were at the values I had used for brute force. I will give the -6/-1 a go as well.
I’ve also put some vraydirt on the plaster walls which helps bring out a bit more detail which is lost with using Irmap for the GI - it seems to work quite well - is this common practice?
Hi, tricky.. and hi all Vrayers !!
did you tried detail enhancement, instead of dirt ? it works well in many cases to catch thin gemetry GI…
of course it slows down a little, but you can try to check it with IM -6 -2 instead of -6-1. you can also raise up a little interpolation samples.
try as start guide hsph * global multiplier * DE multiplier = 16
and reach 32 for final prod render. rocks for me, i often use it.
nice interior, dude !
I think setting the adaptive amount to a greater value than .85 can lead to a lot of blotches. I had this often in the past. Sometimes you can get as high as you want with the ir settings - the blotchiness won’t go away!
On the other side setting it to 1.0 can speed up your renderings a lot without loosing quality. May be there is a trick to avoid this. The only thing i know to avoid it, is to render your ir with 0.85 and change it to 1.0 for the rest of the rendering…
I post this in another thread, in hope to get response from all the vray-gurus. Would be great to get some tips on this.Any ideas???
As far as i know, this just happen with ir in single mode. If you can use multiframe incremental you’re a lucky guy!
