Chaos Corona for Cinema 4D > [C4D] Bug Reporting

Wrong caustic and rendertime

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Suppybird:
Hi, I get very annoying issue. This is 4 test with a simple scene that include a sphere light under water surface:
1.   Plane water with default normal geometry: Bad scatter refraction, very bad caustic
2.   Plane water with reverse normal geometry : Bad scatter refaction, good caustic
3.   Cube water with reverse normal geometry : Good scatter refaction, very bad caustic
4.   Cube water + plane water ( plane water is unseen from camera ) : Good scatter refraction, good caustic, but very very bad rendertime.
Please FIX THIS for it to work good good with all the type of geometry, not only reverse normal. Thanks.

Also, Please think about convenience of user instead rigidly physical things. Example in 3delight renderer, I don't to create a cube with many mesh to render volume refraction of Water, just need a plane. Or seperate raydepth of each object or each material.

Link project: https://drive.google.com/file/d/1jskZnBDzGrg7HUa6vj1DqPzC7aSgSgL8/view?usp=sharing

Suppybird:
Sorry, I did type wrong word " reflection ", it should " refraction ". I re-write it. Please help me to fix this issue. Thanks.

Beanzvision:
Hi, What exactly are you trying to do? Is your scene ready to render? I can just open it and press render to see the results? Are any steps needed? When I do open it I see a few issues. I see a standard C4D camera and no Corona camera tag, there are two sets of water visible, is one meant to be hidden? Your light material is at an intensity of 1000! Which is x999 times too strong ;) It's possible to raise it but that is unnecessary, try increasing the camera's exposure instead or replace it with a Corona sphere light instead. Is the scene and settings to scale? What exactly are these render times and how are they bad? Can you please provide some results for that? 

Suppybird:
I just want to create right caustic with any kind of water and anykind of lights ( not only simple sun ). As u can see, with a plane water, it create bad shape caustic, a have to reverse normal to have right look. And with single cube water, it completely cannot create right shape of caustic. This is not issue of camera. But thanks for the explosure tip.


 I can just open it and press render to see the results -> just do whatever you want as long as u can create right shape of caustic, not matte water is a plane, or a volume object ( like cube, sphere ), no matte it's default normal surface or reverse normal surface.

You can see skot 2 ? THat's render with a reverse normal surface of a plane. And caustic is very fast to render.
And in skot 3 ?  THat's render with a cube, caustic is wronq and very slow to render. Ie mean it must have an issue in there.

Another question, does rendertime is really different when I use a sphere geometry mesh light instead a Corona sphere light ?

Suppybird:

--- Quote from: Suppybird on 2021-08-03, 17:10:41 ---I just want to create right caustic with any kind of water and anykind of lights ( not only simple sun ). As u can see, with a plane water, it create bad shape caustic, a have to reverse normal to have right look. And with single cube water, it completely cannot create right shape of caustic. This is not issue of camera. But thanks for the explosure tip.


 I can just open it and press render to see the results -> just do whatever you want as long as u can create right shape of caustic, not matte water is a plane, or a volume object ( like cube, sphere ), no matte it's default normal surface or reverse normal surface.


Another question, does rendertime is really different when I use a sphere geometry mesh light instead a Corona sphere light ?
--- End quote ---

Please help. Thanks.

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