[osg-users] Capturing all visible nodes

[Isaac Wolf]

Robert,

Thanks again for all the help. Let me see if I can clarify with some images. Sorry I couldn't figure out how to embed them inline properly.

First Issue: disappearing body model

Anything not touched by the textured projection completely disappears, see DisappearingBefore.png and DisappearingAfter.png. I "forced" it to work by loading the model in twice, and only projecting on one. But with just one model (the "After" case), anything not projected on disappears.

Second Issue: "piercing" projections

The second issue is that the texture doesn't stop after it's first intersection. It will project the image onto every single surface it goes through. Again, I only want visible nodes. In Projection1.png, I click to project the image, then I turn the body model and you can see in Projection2.png that it has "pierced" through the model to the regions behind it. i.e. texturing surfaces that are not visible to me. B1 and A1 should not have been projected on the unseen portion of the model.

I'm hoping both of these are simple fixes, I would guess there is some kind of toggle for them, but I couldn't seem to find it!

And I actually have another question for you. With the image projected on the model, would it be possible to calculate the area it covers? Originally when I started this project, I captured all the points "bounded" by four vertices selected by the user, then making elements of these points, calculated the % area of the model it covers (AreaCalculation.png). Is it possible to extract this information from a projected area?

I'm making some great progress overall, and I appreciate the help!

Regards,

Isaac

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Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=75560#75560




Attachments: 
http://forum.openscenegraph.org//files/areacalculation_183.png
http://forum.openscenegraph.org//files/projection2_183.png
http://forum.openscenegraph.org//files/projection1_174.png
http://forum.openscenegraph.org//files/disappearingafter_948.png
http://forum.openscenegraph.org//files/disappearingbefore_110.png