observe from inside of object

[Lucien]

Is it possible in CloudCompare to put the point of view in side of a closed object to observe it from inside?

[daniel]

Yes, but you have to switch to perspective mode. Then either you modify the viewport with the mouse (or better the 3D mouse) or you set the right position with the Camera parameters dialog.

[Lucien]

I picked a point from inside(perspective mode and camera center inside).

But when I zoomed out, I found that the picked point was in fact a outside point

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[daniel]

Are you still using an old version or is it with the 2.8.beta (trunk) version?

There was several glitches that were fixed recently.

Another test (if you did test with the latest version): you can tell CC to perform the picking with OpenGL (see the main options). In this case, does it change the behavior?

[Lucien]

I didn't find the OpenGL option in v2.8beta

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[daniel]

It's the 'never' option of 'auto compute octree for picking'. You can either use the octree (in which case CC performs the picking procedure) otherwise the GPU driver is used.

Can you compare both modes?

[Lucien]

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There is apparently no difference in OpenGL mode. I picked a point from inside but it's in fact the closest point of outside.

[daniel]

But where you actually using the octree/cpu mode before? (as the 'never' option was already selected on your snapshot).

And if both versions (CC or the GPU driver) give the same result, I'm not sure what to think...