Chaos Corona Forum
General Category => Gallery => Work in Progress/Tests => Topic started by: andreupuig on 2012-10-29, 18:28:11
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Hi Coronauts,
I'm working on a theatre for a friend's last year university project. It came just in time for trying this wonderful renderer! Usually I use vray as my renderer of choice, but some details and materials in this project bring me the idea that Corona will handle this better than vray.
The main hard work for vray could be the ceiling: there are series of rectangular extruded profile that light cache and irradiance map will go crazy to calculate. There are also a lot of blurry reflection and some indirect lights.
At this moment I build the main structure and some furniture (the bookshop on the right), I have to fill the foyer with people (the models in the render are just placeholders) and objects like banners, chairs, actors...
"Secondary ceiling lights" are not defined yet, they will come soon. Exterior light is Corona sky for the environment and a Corona sun set at low altitude to simulate a late summer afternoon.
There will be interior and exterior renders.
Meanwhile I'm trying to understand/optimize render settings. I used PT+HC cache as suggested in the tutorials and in the forum, but some settings are still a mistery. I read and re-read the online documentation, I'm sure that with practice everything will become more familiar.
The big question now is how to reduce all that noise in the fartest part, the wall at the end of the foyer. The material is the same concrete on the left, but it is unrecognizable. The nearest part has low noise level (due to a big opening behind the camera...), but the fartest part show high amount of noise (there's a big opening on the left). Another thing that left me astonished is that the low glossiness metal is noise free. I think that the noise on the fartest part of the foyer is carried by the light samples (!??). Obviously every glass is single plane with single sided glass material. I reached pass 41, but at pass 25/30 the render was the same. I think that if I let render few hours more the noise will reduce, but maybe there are some settings totally wrong due to my inexperience.
I'm still working on this scene, I will post updates soon. Bye!
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well, try gaussian at 2 or turn image filtering off
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Hi Coronauts,
I'm working on a theatre for a friend's last year university project. It came just in time for trying this wonderful renderer! Usually I use vray as my renderer of choice, but some details and materials in this project bring me the idea that Corona will handle this better than vray.
The main hard work for vray could be the ceiling: there are series of rectangular extruded profile that light cache and irradiance map will go crazy to calculate. There are also a lot of blurry reflection and some indirect lights.
At this moment I build the main structure and some furniture (the bookshop on the right), I have to fill the foyer with people (the models in the render are just placeholders) and objects like banners, chairs, actors...
"Secondary ceiling lights" are not defined yet, they will come soon. Exterior light is Corona sky for the environment and a Corona sun set at low altitude to simulate a late summer afternoon.
There will be interior and exterior renders.
Meanwhile I'm trying to understand/optimize render settings. I used PT+HC cache as suggested in the tutorials and in the forum, but some settings are still a mistery. I read and re-read the online documentation, I'm sure that with practice everything will become more familiar.
The big question now is how to reduce all that noise in the fartest part, the wall at the end of the foyer. The material is the same concrete on the left, but it is unrecognizable. The nearest part has low noise level (due to a big opening behind the camera...), but the fartest part show high amount of noise (there's a big opening on the left). Another thing that left me astonished is that the low glossiness metal is noise free. I think that the noise on the fartest part of the foyer is carried by the light samples (!??). Obviously every glass is single plane with single sided glass material. I reached pass 41, but at pass 25/30 the render was the same. I think that if I let render few hours more the noise will reduce, but maybe there are some settings totally wrong due to my inexperience.
I'm still working on this scene, I will post updates soon. Bye!
Will adjust the refraction mode Twosided, to reduce glass on the back of Noise.
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Will adjust the refraction mode Twosided, to reduce glass on the back of Noise.
Ops, I was tired...I set the opposite as I wrote. Yes every glass material has TWOSIDED option active.
I tried Gaussian at 2, but I have to reach high pass values to understand the texture on the wall and it blur the image too much. No image filter gives understandable texture faster, but the biggest noise is carried by lights.
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Increase light sample multiplier?
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Increase light sample multiplier?
I set it at 10. In an old discussion Rawalance said that 10 is an extreme value. Don't know if that value was specific for that scene or it has to be considered as a general rule.
http://forum.corona-renderer.com/index.php/topic,167.msg1050.html#msg1050 (http://forum.corona-renderer.com/index.php/topic,167.msg1050.html#msg1050)
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Try to disable on glass material "cast shadow" and if there is glass that light passes through but that is not visible in the viewport hide it completely. Also try to decrease max sample intensity to 2...
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Try to disable on glass material "cast shadow" and if there is glass that light passes through but that is not visible in the viewport hide it completely. Also try to decrease max sample intensity to 2...
As far as I know, you should never disable shadows in Corona as it is non-physical. You can make window glass as a one-sided, single face and in its material properties change type to two-sided, this might help.
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Try to disable on glass material "cast shadow" and if there is glass that light passes through but that is not visible in the viewport hide it completely. Also try to decrease max sample intensity to 2...
dont do this, twosided glass already handles shadows correctly
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Try to disable on glass material "cast shadow" and if there is glass that light passes through but that is not visible in the viewport hide it completely. Also try to decrease max sample intensity to 2...
dont do this, twosided glass already handles shadows correctly
I'm looking glass material improvement.At present, the use of twosided glass, do not show the correct refraction.
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I'm looking glass material improvement.At present, the use of twosided glass, do not show the correct refraction.
Why? Can you post examples?
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Twosided material glass works fine with singlesided object, no problems, really. Surely I will never make fakes as you [keymaster, Rawalance] suggested ;)
Another thing: which are best settings for bitmap texture? The default filtering, pyramidal, with default blur, 1.0, gives me extremely blurred textures. I set everything as none filtering and 0.1 in blur.
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Twosided material glass works fine with singlesided object, no problems, really. Surely I will never make fakes as you [keymaster, Rawalance] suggested ;)
Another thing: which are best settings for bitmap texture? The default filtering, pyramidal, with default blur, 1.0, gives me extremely blurred textures. I set everything as none filtering and 0.1 in blur.
I would guess that when you use no filtering the blur value is ignored ;). Use what looks best for you, I'll try to make the shading more consistent
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I'm looking glass material improvement.At present, the use of twosided glass, do not show the correct refraction.
Why? Can you post examples?
Figure 01 and Figure 001“Onesided”
The shadow of caustics
Refractive index correctly
Figure 02 and Figure 002 “Twosided”
The light can penetrate the object
Refractive index will disappear
Figure 03 The use of Vray
Selection effect of Shadows
The refractive index is not affected, but the light can penetrate the object
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well with twosided you turn the ball into a very thin bubble if i'm not wrong so it's not a solid/glass filled object.
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It is supposed to work this way. Everything is fine. The only non-realistic thing is that last vray render.
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It is supposed to work this way. Everything is fine. The only non-realistic thing is that last vray render.
Really?Maybe I did not pay attention.
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It is supposed to work this way. Everything is fine. The only non-realistic thing is that last vray render.
Exactly, when you have to render a window glass, you don't want distorted refractions. You modeled a sphere, but a window glass is just 6mm thick. In vray material there are similar options as Corona under the tab options (double-sided and reflect on back side). Solid glass material brings more computation and unnecessary caustics.
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Solid glass is for thick objects like a block of glass. Thin glass is for thin objects that need to be reflective and transparent like soap bubbles.
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Continuing working on the scene and added some objects. Passed a morning mapping some books (almost everyone from my real library).
Trying to solve the high noise level in the center of the image. I remodeled the hanged lights reducing the number of polygons (it was a rendered spline with 8 sides, now 4 and with less subdivisions) and removed some lights on the ceiling making them smaller, 3 meters long. After 2 hours and 12 minutes (rendered with max buffer, it didn't print the stamp) I reached 67 passes.
There are still some noise on the metal blades of the ceiling, I'm trying to discover what cause it; with a render region I reached something like 300 passes and the noise is stille there...
Bye!
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Yes, twosided material is designer for something like glass in windows or very thin glass, such as light bulb glass :)
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Finalizing and tuning lights for the exterior view. Surrounding buildings will be heavily photoshopped.
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Don't use Box filtering, use Tent or Cone, I don't think box works correctly.