Chaos Corona Forum
Chaos Corona for 3ds Max => [Max] Bug Reporting => Topic started by: Ahmad Kouti on 2021-07-27, 15:30:10
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Hi,
Please check the difference between Corona Bitmap and 3DsMax Bitmap, why is Corona Bitmap low quality in the viewport?
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Check your viewport settings. Open viewport configuration>display performance and in viewport images and texture display resolution set all 3 spinners to the equal value. See if that makes Corona and native bitmaps to be displayed at equal quality in the viewport.
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Check your viewport settings. Open viewport configuration>display performance and in viewport images and texture display resolution set all 3 spinners to the equal value. See if that makes Corona and native bitmaps to be displayed at equal quality in the viewport.
texture quality is 8000
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Please do as i said and report back, thanks.
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Please do as i said and report back, thanks.
It still has the same problem
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That's strange. Did you try to restart 3ds max?
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That's strange. Did you try to restart 3ds max?
I've had the same problem with several systems in the last few months, I don't think the problem is with my 3DsMax.
I think I had this problem in previous versions with Corona Bitmap and reported this problem.
Just try with a good quality texture and zoom
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Is it with all textures, or only with some? If it's the latter, then i'd suggest to upload the texture in question for the support team investigation. https://corona-renderer.com/upload
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Thanks
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No problem. Don't forget to leave the file name here after you will upload it.
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Hi. Just tested this on max2020 and Corona7. Seems like there's a loose connection :) Sometimes it works, and sometimes it doesn't.
So try changing the values back and forth and see if it suddenly works.
Hope it helps
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Hi I don't believe this is a Corona issue, seems like a 3ds max inconsistency. After meddling a bit, my regular bitmap returns worse quality in the viewport.
You might also want to try altering CoronaBitmap interpolation and refresh the material in the viewport.
Lastly can you please clarify if you are using any corona-texmap nodes after Corona bitmap?
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Hi,
I am from the Corona support team & I have gone through your issue.
Some troubleshooting steps & advice are as follows:
1. By default, Corona bitmap textures have better viewport quality than native 3ds Max Bitmap on the viewport. Please see the comparison below.
https://prnt.sc/1h03o3l
2. I think it is already covered before but I would like to make sure that you are using good viewport Images and textures resolution which can be set here. Make sure the value is not downscaled. see the screenshot link: https://prnt.sc/1h04a28
3. Try changing the Filtering of bitmap and check if there is any improvement. See a short video here showcasing Corona bitmap vs Native bitmap.
https://bit.ly/3BQG5eb
I have some questions for you:
1. What version of Corona and 3ds Max are you currently using? I recommend you to use the latest version if possible. The current latest version is Corona 7. There is a high chance if there was any possible bug in the past, it would have been rectified in the latest version already. https://corona-renderer.com/download
2. What is the resolution of your texture? is it 1k, 2k, 4k, etc.
3. What is the Image file extension? Is it a JPG, PNG, Tiff, or TGA file?
4. Can you send us a screenshot of your display driver being used by your 3ds Max application.
https://prnt.sc/1h06ita
Last but not least. Please send us your file using our private uploader: https://corona-renderer.com/upload
Please do mention your scene name once you have finished uploading.
Looking forward to hearing back from you.
Regards,
Avi
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There is a problem with displaying CoronaBitmap in viewports. Plugging exactly the same image file (be it .jpg .png .bmp, it doesn't matter) to a std Max Bitmap slot and CoronaBitmap slot, and then trying both on a corona material (Legacy or Physical, don't matter) always results in visible difference between the two in the viewport, in favor of the std Max Bitmap. Corona bitmap displays so poorly that any accuracy adjustments to mapping on objects need to be performed with std Bitmap just to see what you're doing, cause you cant see sh*t trying to use Corona bitmap, which displays blurred, compared to Max Bitmap (at exactly the same bitmap settings. And yes - cranked up)
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There is a problem with displaying CoronaBitmap in viewports. Plugging exactly the same image file (be it .jpg .png .bmp, it doesn't matter) to a std Max Bitmap slot and CoronaBitmap slot, and then trying both on a corona material (Legacy or Physical, don't matter) always results in visible difference between the two in the viewport, in favor of the std Max Bitmap. Corona bitmap displays so poorly that any accuracy adjustments to mapping on objects need to be performed with std Bitmap just to see what you're doing, cause you cant see sh*t trying to use Corona bitmap, which displays blurred, compared to Max Bitmap (at exactly the same bitmap settings. And yes - cranked up)
When calling something sh*t, could you please at least attach a screenshot?
Here is mine - I was about to play a game of "guess which one is Corona", but I actually got visible difference in the "1234" bitmap, probably because it's stretched.
The other ones look identical, so I can't confirm your statement "always results in visible difference".
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Hi maru
Yes, of course. Pls see attached examples. This is not something related to this machine, this job, or this file (btw, it's a fresh file with nothing else in it apart from a plane with CoronaPhysicalMtl). This issue of CoronaBitmap displaying at fraction of the quality of std Bitmap in Max viewports has been nuisance for as long as I can remember. Now, it's entirely possible I have been missing sth simple all along, which wouldn't bad news if you could point me to a quick fix. All other parameters are kept equal.
Std Bitmap https://prnt.sc/fvst_YAVfK5r
CoronaBitmap https://prnt.sc/NZmgZ6Dbplxw
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Try to do comparison with all 3 textures options set to the same value, e.g. 4096. AFAIK Corona bitmap uses baked procedural maps, while standard bitmap uses texture maps. You may need to restart 3ds Max to see the changes.
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I think I found a solution. At least in case of this simple scene it fixes the issue completely. Low quality viewport display of CoronaBitmap only occurs at "Standard" viewport setting in Max. Change it to "High Quality" and it goes away. Be interesting to see if it helps others with similar problem.
Standard https://prnt.sc/3OwXUEk2-au0
High Quality https://prnt.sc/v5NL4vY1owZA
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Whenever I need to see a bitmap in detail in the viewport I know I need to use a regular bitmap node.
I thought that was a known issue with coronaBitmap.
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Guys, if you can consistently reproduce a Corona Bitmap looking "worse" in the viewport, please send us a sample scene. I was not able to get anything meaningful.
On the other hand, whatever is happening here, it's probably handled by 3ds Max.
You may also need to check your GPU driver settings - things like anisotropic filtering, texture filtering quality, etc. I am sure those options affect texture quality in the 3ds Max viewport.
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I just tested this again and it doesn't happen with the current Corona version.
In the past I was unable to see the actual resolution of an image on the viewport with coronaBitmap.
Not anymore.