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Black renderings with mirrored objects
Posted: 20 November 2012 04:19 AM   [ Ignore ]
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Hi all.

I’m using DAZ Studio 4.5, Win Seven Home Premium 64 and a graphics card ATI 5770.

Recently I created some smart props combining some basic shapes, exporting in obj, re-importing into the scene and finally saving them as props.

To create symmetrical objects, i.e. a pair of earrings or bracelets, I pick the left one, duplicate it, apply scale x = -100% and voilà.

The problem is that all the objects with x-scalling -100% are rendered totally black, no matter which and how many lights I’m using. They’re black even if I render them with the “system” lighting.

I’m using the software 3Delight engine.

Is there a way to solve the problem?
Hope you can help.
Giorgio

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Posted: 20 November 2012 05:32 AM   [ Ignore ]   [ # 1 ]
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Negative scaling used to work, but it hasn’t been for some time. It might be possible to fix the issue if you take the OBJ into a modeller and reverse normals, but I assume you are wanting to avoid that.

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Posted: 20 November 2012 05:47 AM   [ Ignore ]   [ # 2 ]
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Thanks for the answer.

Actually, Studio is the only software I have. No external modeller. I create quite simple props and don’t need it.

So, what could I do? is there an alternative way to “mirror” a custom prop easily? The swap/symmetry doesn’t work, I guess.

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Posted: 20 November 2012 06:41 AM   [ Ignore ]   [ # 3 ]
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Hexagon is free, as is Blender - I would have a look at one of those.

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Posted: 20 November 2012 07:16 AM   [ Ignore ]   [ # 4 ]
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Ok, I’ll do that. I should have a copy of Hexagon somewhere. Thanks.

What am I supposed to do with this software? May I change the object parameters without modifying the object itself, as to avoid conflict with the rendering engine?
Sorry, but I’m completely ignorant of that.

EDIT: I found a discussion about that. I’ll try to understand something, before asking your help. wink

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Posted: 20 November 2012 09:33 AM   [ Ignore ]   [ # 5 ]
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Actually the easiest way to do it would be to use the free PropViewer…

http://www.sharecg.com/v/47408/View/11/Poser/PropViewer-3.2

Simply open the obj in PropViewer, hit Invert and the export as OBJ…

The cone on the left was scaled -100 % Y-axis, the one on the right ‘inverted’ (which means ‘flip all normals’, in PropViewer lingo)...in PropViewer   The ‘fix normals’ option aligns them all the same way…so if they are all pointing ‘in’, it won’t do anything.

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Posted: 20 November 2012 12:25 PM   [ Ignore ]   [ # 6 ]
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PropViewer works perfectly! Thanks! smile

Richard, the issue of the normals inverted has to be considered a bug to be fixed, sooner or later, or a normal consequence of the negative scaling?

Thanks both again.

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Posted: 20 November 2012 01:03 PM   [ Ignore ]   [ # 7 ]
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I don’t know if it will be regarded as a bug to be fixed or not - I have complained about it myself, as I said earlier it used to work and to be useful - but if it isn’t reported it certainly won’t be changed.

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Posted: 20 November 2012 04:00 PM   [ Ignore ]   [ # 8 ]
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What was the ‘bug’ was the old behavior…3Delight uses normals the way they were intended…which is the way DS is now working, but DS used to ‘ignore’ normals, so it didn’t matter.

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