I have been playing around with corona for the last few days and I am stumped. My current machine specs are
dual x5650 @ 4GHZ
24GB Ram
amd firepro
When i render a scene similar to some of the test scenes i see on the home page. I see their render times of 20-30 minutes and they are virtually noise free, using CPU’s slower than mine. But my are still full of noise and take about 2 hours or more to achieve the same level of noise reduction. Do these guys have special stuff going on in the background I don’t know about? I am loving Corona so far though. Thx for any insight.
I must admit (maybe i’m wrong) that A2 and A3 were faster but a lot buggy than the recent dailies, for example the red sofa render in corona home took me this time without using noise reduction tool and it was rendered with the A3 i think, i reopened with the new dailies and i see the floor reflection got noise a lot more than before if i remember and having the same rendertime it still got some noise on it… I repeat maybe i’m wrong but this is what i see comparing to the speed of the A3 and A2.
In Corona, as in any other renderer, it is essential to stick to certain rules if you want to keep everything smooth and fast. So when you are writing “a scene similar to some of the test scenes I see on the home page”, I suspect that what really should be written is “a scene visually similar to some of the test scenes but prepared in a different way”. Be sure to read this:
If you are doing everything correct, then it would be nice to see your render settings, materials and wires.
Yes, corona lost a lot of “brute force power” in the last few versions. This was necessary to facilitate the advanced fake/shading/scaling/… algorithms. As a result, some scenes might render slower, maybe by a factor of up to 50%. But this was necessary to
implement algorithms that allow rendering of scenes that could not be done at all before
to be able to render fast some scenes that tool extremely long time before. In other words, even though generally it is a little bit slower, there are many scenes where new version is 10 times faster - motion blur, lots of lights, …
Anyways, I will improve the speed in the future versions by implementing some smart stuff like progressivity and even better light sampling
To optimize:
use secondary GI solver HD cache, always for interiors
do not use any artificial lighting rigs. Only environment light and scene emitters like lamps, but not invisible lights in windows
add portals for an extra boost
Nope, they still remain optional. There are even situations where they will slow down the rendering a bit (huge windows, very dynamic HDRI)
Thats explains a lot. I rendered car interior recently and was wondering, why portals in car windows, added quite significant slowdown. Now, i know why :]
You’re right i prefer a little bit slower build but more stability and features like with the recent dailies so for me it’s not a problem i’m enjoying it so far and it’s just an alpha build so i’m so excited for the beta ones and the final, amazing job guys and for me Corona renderer is the future for sure no doubt !
Use simple bitmap, adjust white point and black point in HDRI or EXR depends on what you use for map to adjust gamma.
Exposure compensation works same as on DSLR camera, Highlight compression works same as Clamp output(avoiding over burning white points), both should be higher in your case, almost washed out.
Use Lights multiplier samples on default 2.0
Try using 32 PTS with default maximum sample intensity 20.
Absorption on your glass is way too high, try using double sided for refraction mode.
Try using default values first. Avoid using additional lighting in scene, except for Spots, lamps etc.
Try hiding glass on your windows and default values just to see how it goes, troubleshooting scene to see if there is something you should not have inside.
