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Simple 3d model artefacts and interference
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July 13, 2017, 03:01:25 AM
Hello,
I've created simple 3d model. On the joining places, there are strange 'artefacts'. I've used 3d boolean operations (subtract) as well as the simple joining to make this model out of 3 parts, and on those places the interference shows.
I have not changed the color or material of the parts, all are of same properities. The lightning is default as well.
Interference is visible only with quality rendering enabled (not on draft).

Any ideas?

« Last Edit: July 13, 2017, 03:59:04 AM by tarmiricmi »

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Windows 10 64bit
TC 2016 Pro 64bit, RedSDK
Lenovo M92p I5 3550 8GB RAM NVIDIA GForce GTX 1050ti 4GB


* July 13, 2017, 04:36:10 AM
#1
Difficult to be certain from just the animation,  but that sort of artefact usually occurs when the faces of two objects are occupying the same space, like TC doesn't know which one the user wishes to show.

Note - the odd triangular faces are simply due to my v2015 installation gone wonky and nothing to do with the artefacts on the faces.
« Last Edit: July 13, 2017, 04:38:46 AM by Andy H »

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July 13, 2017, 04:40:05 AM
#2
Here is the tcw file.
I've tried on the another machine, same problem persists on the same places...
« Last Edit: July 13, 2017, 04:43:09 AM by tarmiricmi »

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Windows 10 64bit
TC 2016 Pro 64bit, RedSDK
Lenovo M92p I5 3550 8GB RAM NVIDIA GForce GTX 1050ti 4GB


* July 13, 2017, 05:44:09 AM
#3
OK,   yep its because the faces are overlapping (I think its called coincident - but not sure),  once you clean up the parts added, subtracted, sliced etc.  it will go away, in real life faces cannot occupy same space and although allowed in TC one gets artefacts, this is nothing new, been the same for many years,  this can occasionally also occur even without coincident faces if the faces are for example 0.001mm apart.

I didn't know how the parts fit together so just guessed.  ## Edit ## to subtract blue from red, I drew a box and subtracted using the box rather than the blue to avoid problems subtracting coincident faces, which can very occasionally occur, ## End Edit ##

« Last Edit: July 13, 2017, 06:14:38 AM by Andy H »

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July 13, 2017, 07:05:10 AM
#4
OK,   yep its because the faces are overlapping (I think its called coincident - but not sure),  once you clean up the parts added, subtracted, sliced etc.  it will go away, in real life faces cannot occupy same space and although allowed in TC one gets artefacts, this is nothing new, been the same for many years,  this can occasionally also occur even without coincident faces if the faces are for example 0.001mm apart.

I didn't know how the parts fit together so just guessed.  ## Edit ## to subtract blue from red, I drew a box and subtracted using the box rather than the blue to avoid problems subtracting coincident faces, which can very occasionally occur, ## End Edit ##

Excellent. Thank you very much for clearing that out.

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Windows 10 64bit
TC 2016 Pro 64bit, RedSDK
Lenovo M92p I5 3550 8GB RAM NVIDIA GForce GTX 1050ti 4GB