Render pass to show Overlapping, co-plainer or Double faced Geometery

[meggeldens]

Hi, relevantly new user to Corona here.

I do a lot of cleanup work, and checking of imported, or other peoples models. Part of this process is checking for overlapping geometry that may cause issues once different textures are applied. I am wondering if there is a render pass in corona to help me see these overlapping, co-plainer, double faced geometry.
I usually do this in Vray using a Dirt map in tex pass, The resulting render shows overlapping geometry "grungy" compared to the good geo.

I am looking to transition from Vray to Corona (at work we have both) and the Corona AO map dosent behave in the same way. Is there another pass or texture type you could recommend to help identify problems with models? 

appreciate your advice!

[romullus]

Hi,
3ds Max has xview for this kind of checks.

[meggeldens]

Thanks romullus,

While I do use Xview for smaller models that are 1 object, I use the render pass in camera for large scenes, with many objects. I want so see the overlapping faces and Geo even if they are different objects. The render pass in with Vray Dirt shows this and is also, especially useful when I have gotten a camera approved already and I only need to fix what the camera sees, that's why I was hoping to know if there was a Corona version to do the same thing.

[romullus]

Wouldn't Corona AO do the same trick? Try to add texmap render pass with Corona AO in it.

[meggeldens]

Yeah, the AO was my first thought on setting up the passes for this purpose. However it doesn't behave in the same way Vray dirt will when the polys are overlapping. Corona wont show me an issue unless there is a different texture / material on the overlapping faces, and at this stage of our pipeline the scenes usually have a blank material.

I've been doing a bit of discussion and research before I made this post with some coworkers and the closest behavior we came up with was to set the AO with both int and ext corner angles. It then shows us a sort of outline of the overlapping polygons but you have to look very carefully, and it not as apparent as the vray dirtmap. So I was hoping a more experience Corona user may have a better solution. 

[GeorgeK]

Yeah, the AO was my first thought on setting up the passes for this purpose. However it doesn't behave in the same way Vray dirt will when the polys are overlapping. Corona wont show me an issue unless there is a different texture / material on the overlapping faces, and at this stage of our pipeline the scenes usually have a blank material.

I've been doing a bit of discussion and research before I made this post with some coworkers and the closest behavior we came up with was to set the AO with both int and ext corner angles. It then shows us a sort of outline of the overlapping polygons but you have to look very carefully, and it not as apparent as the vray dirtmap. So I was hoping a more experience Corona user may have a better solution.

STLcheck modifier is my go to tool when I am handling problematic geometry but it's not perfect.

[romullus]

Stlcheck is more suited for 3d-printing oriented models. Many objects that are perfectly fine for rendering, still throw errors with stlcheck.

[meggeldens]

Thanks GeorgeK, Stl check isn't really useful for what I'm looking for. We use a render pass in Vary as the Geo we work with goes on for still and animations, and depending on time constraints, it can pass through to production even if there huge mess in areas the camera doesn't see. I was hoping to find a similar method in Corona to use it more permanently over Vray.

[meggeldens]

Ill assume that Corona dosent have this exact functionality as a render pass, ill have to keep using vray to get exactly what I want for now.

[maru]

If you could post your Vray and Corona results and a sample scene (like some simple glitched geometry), we could see if we can get something similar in Corona.

[meggeldens]

Hey Maru,

very interested in what you could come up with

basic scenes i've set up are here

https://drive.google.com/file/d/16rfToxpQ0zYjcrtI4EIFUdZ-9L6qDCcL/view?usp=sharing

vray ex tex map with overlapping polys shows issue like this

https://drive.google.com/file/d/1m5rTnwOmA10MhlDSwm1W4eQLm--mcQKg/view?usp=sharing

corona ao dosent behave the same way the overlapping polys show no error if the same material is applied what we have gotten to half work is to show the edges but not the overlapping faces
we set it up like this

https://drive.google.com/file/d/1h4v4qR3sX7cJLDPFN1w5V4es-uARlYpd/view?usp=sharing

and it gives us a result like this

https://drive.google.com/file/d/1-yPrKps9-1EVtxIniMtcSlbBz5yMZbTV/view?usp=sharing


Thanks for any assistance,
PS - I havent posted links to a forum in too long, please let me know if I didin't do it right ^_^