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Occluded faces still selectable when using the select brush with intersecting meshes
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Description

Group: V 2.47 release
Resolution: New
Category: Tools

Vista Home Premium SP1 64
AMD Athlon 64 X2 5600+ @2.8GHz
Nvidia Geforce 8800GTX with 177.92 beta drivers
6142MB RAM
Blender 2.47 final

Hey there,
When the occlude background geometry function is on, it is still possible to select occluded faces when using the select brush with intersecting meshes.

e.g. When mesh a is intersected by mesh b, the occluded faces of mesh b are still selectable through mesh a even though they are not visible.
(i realise the partially visible faces should be selected :) )

1. Select the chain_lp mesh and go to edit mode whilst ensuring the occlude background geometry is on
2. Enable the brush select by double tapping b
3. select the chain_lp with the brush
4. Rotate the mesh so the previously occluded faces are visible
5. Faces which were occluded are selected

I have made a video of this problem here
http://www.metalliandy.com/blender/unseen_faces/unseen_faces.htm

Thanks for the help :)








Event Timeline

You disabled the occluding mesh from the selection code... thats why.

Ton Roosendaal (ton) changed the task status from Unknown Status to Unknown Status.Sep 8 2008, 3:38 PM

Thanks for looking Ton.
Im sorry if i sound a little dense, but im not sure exactly what you mean.
Do you mean that the dirt_lp mesh has the "restrict/allow selection in the 3d view" toggled to not selectable?
If so the same thing happens when it on.

Does the fact that the chain_lp is occluded by the Dirt_lp not matter because they are separate objects?
When i join them as one object the selection works as normal.
Could you please explain a little further.

Thanks again :)

I'm an idiot... it's not the 'restrict' flag, it's the fact that for editmode selection we draw the active object totally separated in a selection buffer, so you can always select things. It's a convention that doesn't always work as expected, but it does make drawing selection buffers fast and predictable.

Ahh ok...that makes more sense :)
Thanks for taking another look Ton.

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