Chaos Corona Forum
Chaos Corona for 3ds Max => [Max] I need help! => Topic started by: dfcorona on 2021-01-27, 07:43:21
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Hello,
I have a vehicle I am rendering that has labels that need to go onto it's windows. I did this by using CoronaLayeredMTL. Base layer is glass, other layers are labels that pair up with UVW Map modifier with different Map Channels. I noticed it doesn't work if I use CoronaBitmap node with the b&w alpha channels for the masks. If I use 3dsmax bitmap it works just fine. But I also notice it darkens the panes of glass that have labels on them. I couldn't figure out why only the glass panes with labels were now darker. Then I finally found that if you have "Thin (no refraction)" on like I always had it darkens the glass with labels. Turn "Thin (no refraction)" off and the panes with labels now render exactly like the ones without. Of course now my renders take way longer with "Thin (no refraction)" off. What is going on here? is this a bug?
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We would definitely like to look into this. Could you please post example images and screenshots of your material editor, or even better the scene itself?
If you can't share this publicly, you can use our private uploader and let me know of your file name: https://corona-renderer.com/upload
Thanks!
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Okay I uploaded the scene file to you guys, It's a client project so it has to stay private.
In the Slate Material Editor you will see that there are 2 Tabs. One for "Street" & another for "Glass". The "Glass" tab has 2 material setups, one with thin, and one without thin Refraction. So you can select the glass object with the labels on them and just apply each material to see the difference. You will see that while using thin refraction on, the glass will get darker. You can compare that to the 2 center glass doors. Also the render time gets shorter of course because of thin refraction on. If you use a CoronaBitmap for the Alpha maps in the Mask Layers for the CoronaLayeredMTL, you will see it doesn't work correctly. Only 3dsmax Bitmap will work right.
Another issue I brought up in another thread that is also in this scene, Is the "CoronaUvwRandomizer". If you have "high quality blending" enabled it more than doubles the render time with only one map. This seams like a bug or can be made much more efficient. You add a few maps in the scene with "CoronaUvwRandomizer" with "high quality blending" enabled and your render times can skyrocket. Please see comparison times below for just one map in this simple scene.
"CoronaUvwRandomizer" with "high quality blending" ON - 3min 55sec
"CoronaUvwRandomizer" with "high quality blending" OFF - 1min 25sec
I uploaded the File using your Dropbox Option cause the .zip file is 512MB. The file is Labled "Don Farese - Test Scene For Corona.zip"
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Have the Dev team had a chance to look at this yet?
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Sorry, not yet. We will look into it ASAP.
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Sorry, not yet. We will look into it ASAP.
Anything yet Maru? This is killing out animation.
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Once again sorry for the delay. It shouldn't have happened. I have just sent you a message to your forum email address.
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(Report ID=CRMAX-266)
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Update: some of the reported issues were caused by using Corona Renderer version 6 instead of version 6 Hotfix 1.
We have also identified some other issues, which are logged in our bug tracker.
And there are some remaining issues concerning the UVW Randomizer, which we will look into.
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Thanks again for all the help, Great Team!