qmc surprise

[mirjman]

Hi folks-

Has a surprise today when I started playing with the qmc render presets. I used gi_qmc_lc_low.visopt on a simple model and noticed that the buckets rendering just the ground plane (a displacement grass material) processed dramatically faster than the buckets rendering the plain vertical surfaces (default SU material)

what is the factor causing this behavior, is it the lightness of the SU default material that slows it down? I expected the displacement portions of the render to slow down to a crawl, not the simple geometry.

[farvinpopper]

Re: qmc surprise

Mirjman,

I don't have any idea what the answer to your question is, and I apologize for an off-topic response, but your displaced grass material looks like one of the best I have seen. Would you mind sharing your vismat?

Thanks

[fpedrogo]

Re: qmc surprise

In term of the sampling. V-ray calculate the brighter pixel with more precision than the darker.

Best

[mirjman]

Re: qmc surprise

@fpedrogo thanks for the insight

@farvin, the grass is just a quick material - use a noise map (very small scale to get a lot of grains) in the displacement slot. watch out because it looks like carpet at larger scales if you don't adjust the size. image above is also aided by grainyness of low qmc settings


I have another issue with this setup that hopefully someone can help me with - why is this dark triangle appearing when I use a non-square shape for the grass plane?