Topics

1

[C4D] I need help! / I'm getting NaN warnings and strange light behaviour

« on: 2024-08-22, 07:25:18 »

Hi,
I working on an interior animation project.
I have very strange light behavior with some of my lights - I have some rectangle lights that produces much higher amount of noise than other lights. As you can see in the 3 pics attached, when I move the light I'm getting high noise in the light area. When I change the directionality percentage of the light, the cone of noise I'm getting also changes. This happens with many lights in the scene (But not all). It happens also when I use Override mtl in the settings, so it's not a material issue. I'm having this issue in corona 12(hotfix 1) and also in corona 11. Notice that the high noise levels are seen in areas that are not lit by the light (Because its behind a solid object) but are inside the light cone. I've tried copy everything to a new scene but it didn't help. I also tried to use all GI solvers. This issue is causing very high render times (6 hours per frame instead of about 40-60 minuets as i'm used to get for this resolution & noise level in interior projects with my AMD Ryzen 7950X3D).
Another problem I have with this scene is that when I use corona 12 (hotfix1) in C4d 2024 I sometimes get Nans warnings and C4d crushes after a few frames. When using Corona 12 with C4d R24 I don't have crushes but also have Nan warnings sometimes. When using Corona 11 on this scene I have no crushes and no NaN warnings no matter what C4d version I use.

I've opened a ticket about this issue and sent the project file, but in case anyone here has an idea why this is happaning, dont be shy

2

[C4D] I need help! / Layers compositing problem

« on: 2024-06-20, 10:08:27 »

Hi,
I have a jewelry store and I need to render 3 different images for my client:
1. Only the store (walls\floor\pictures on the wall\trees outside ect.) without the jewelry and without all the stands of the all the jewelry pieces.
2. Only the stands of the all the jewelry pieces without anything else.
3. Only all the jewelry pieces without anything else.
The client need the images in PNG with the correct alpha imbedded so that when he put the layers together the image will look perfect. Note that he can put them together only in "normal" mode (no linear dodge\screen or any other photoshop layer blend mode - he is doing that with python script for further use in a certain application)  - So I can't use the multipass system for that and export a PSD file. It has to be PNG.
Another thing to think about - for example, when rendering only the jewelry, I need that all the jewelry that is obscured by other objects (like the stands\store) will not be rendered.

The problem - No matter what I've tried, when I compose the Images There is a halo around the layer of the jewelry and the layer of the stands. Sometimes is a black halo, and in other methods is a transparent halo.
I've tried using the compositing tag and tick\untick the "seen by camera" on each render as needed.
I've also tried using the Include\Exclude option in the Corona render menu in the General settings tab.
Obviously I'm doing something wrong because it's only logical that I could do what I need....

So...What am I missing ? What is the correct way ?

3

[C4D] I need help! / Exclude object from corona sun doesn't work

« on: 2023-12-28, 14:06:21 »

Hi,
I'm trying to exclude a big cylinder with a city texture from a corona sun, but it doesn't seems to work, please see attached images
I'm still on corona 10. C4D R2024

Never mind, I found the problem

4

[C4D] I need help! / Strange squared artifacts

« on: 2023-02-20, 14:33:17 »

Hi guys,
I'm having strange artifacts in my renders (render sample attached) - I want to say that it looks like a bucket problem but I don't know if corona is rendering behind the scene in buckets like vray...
Anyway, anyone has an idea why this is happening ? I have a dead-line for Thursday and really need a solution fast
Peace,
Kobi

5

[C4D] I need help! / How to get the correct alpha channel for this problem

« on: 2022-10-18, 09:57:34 »

Hi,
I have a problem in a very complex scene under NDA so I simplified it for the sake of the question - I have 2 objects in the scene and a camera animation (rotating around those objects).
My problem -  I need to produce a render sequences that has only the visible part of the blue sphere visible in the render, and everything else is Alpha - Including the green part of the torus that is in front of the sphere. Like in the second attachment - only what I highlighted should be visible in the render, everything else should be Alpha
how can I achieve that ?

6

[C4D] I need help! / Render hair like in native c4d

« on: 2021-08-22, 11:07:17 »

Hi,
I bought a model of a goat with hairs done with native c4d shaders. I need to replicate the same "look" of the hairs in Corona. I didn't find any tutorials and I'm a bit confused what will be the best way to do this.
I already turned on "render hairs" in the generate tab of the hairs and I tried using the Corona hair material, but no matter where I put the diffuse map of the goat I get an ugly looking fur with a solid color all over it instead a nice fur like it should.
Any idea what I'm doing wrong ?

7

[C4D] I need help! / Problem with the "Corona Shared" shader & Rebus

« on: 2021-05-05, 12:42:53 »

Hi,
I'm trying to upload a scene to Rebus and i'm getting lots of "Corona Shared" shader errors.
The main issue is that I've never used this shader in any of my materials. I've checked all of them and I can't see it anywhere.
I also did the Edit -> Delete unused materials
Any Idea why is this happening or what else can I check ?

Kobi

8

[C4D] I need help! / Weird flickering in animation with volumetric material

« on: 2020-11-27, 07:13:20 »

Hi guys,
I'm rendering an animation and I'm having a weird flickering in the volumetric material.
At the attached examples, look at the letter "A", at the bottom right, there's a weird spot that is changing during frames and actually it doesn't suppose to be there at all.
Any idea what can cause this ?

Kobi

9

[C4D] I need help! / Need help creating a material

« on: 2020-11-11, 14:02:09 »

Hi guys,
I need to make a wall of tiles with the material as shown in the attached pic.
I modeled a brick, but I have no idea how to create the effect of the material where it fades near the edges of the model. I think I should use vertex maps ?? but I've never used it before...If someone can help in pointing me how to start doing this it will be great.

Peace,
Kobi

10

[C4D] I need help! / Need help creating this shader

« on: 2020-07-16, 07:22:50 »

Hi guys,
I need to create a shader that will give a similar effect like the material in the attached pic...
Iv'e tried many many settings but didn't even come close.
Any help or tips are much appreciated

Peace,
Kobi

11

[C4D] I need help! / Problems with reflections in animation

« on: 2019-11-12, 09:06:19 »

Hi guys,
I took an old scene I made 3 years ago in VRay and converted it to Corona in order to make some animations. The exterior shots are great but I'm having some problems in the interior...
I attached the first 3 frames - I'm having "flickering" in some areas with high glossiness - You can see it in the kitchen appliances in the back (which I can solve by simply deactivate those reflections), but the main problem is in the wine glasses. The first test render was set to a level of 5.5% noise and took about 1 hour per frame to render (16cores\32 threads machine), than I lowered the noise to 4% - the render took 2 hours per frame but the results are not much better.
The glass material is simple glass (screenshot attached)
So, is this a normal ?Any solution other than loewr the noise level ? I can't lower the noise threshold anymore - render times will get too high....
And another question - When I rendered a certain test frame to picture viewer it took 1 hour. When I rendered the same frame with same settings with Interactive render it took only 47 minuets to get to the same level noise. Why so much difference between the two ?

Peace,
Kobi

12

[C4D] General Discussion / CXR files saves automatically in preference folder ??

« on: 2019-09-09, 06:19:16 »

When Corona 3 came out there were a few threads about the fact that we can't save the CXR files that we render directly from  the "save" menu of C4D.
Today I found out that my HD was filling with hundreds and hundreds of CXR files...everything I render is kept in the preference folder of C4D. So I'm wondering about couple of things:
1. In all the threads about this subject nobody ever mention that all the CXR files are saved to the preference folder...not even the developers...seems a bit weird....
2. Is corona saving all my renderings because I ticked "automatic saving on render end" in corona preference (pic attached section mark in red "1")
3. In the pic attached - I highlighted a section in red marked "2" (output auto save) - It's not "on" by default. What does it do ?

Peace,
Koni

13

[C4D] General Discussion / Bloom&Glare flickering in animation

« on: 2019-09-08, 06:14:13 »

I'm rendering an animation of a product, and I get flickering from the bloom&glare in some areas...
The flickering is in the top right corner in the green buttons. The material of the buttons is just color+self illumination.
When I rendered a short small test of this shot I didn't had flickering. I also rendering now other shots of this product, and I'm not getting flickering...
All the settings in corona render settings are at default. GI solver - UHD cache with secondary GI preset set to Animation.
Any idea\solution ?

14

[C4D] I need help! / weird black dots\firefly

« on: 2019-08-27, 17:35:16 »

Hi guys, I did a test render for a client - everything is ok, than I increased the resolution for final render, and I get weird black dots\firefly all over the render...other views\cameras of the same project are rendering now without problem.

What can cause this ?

C4d R20 + Corona 4

15

[C4D] I need help! / Team render produce very dark renders

« on: 2019-07-21, 08:01:42 »

Hi,

I have a serious problem with TR, and this happens to me on many scenes....
When I try to use TR (in any mode - manual\automatic\arbitrated) I get very very dark renders, and in arbitrated mode I get wrong colors on some objects - Any idea why ?

Kobi