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Ender1618

Point Cloud Occlusion

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I am trying to write visualization software for large point cloud databases.

One feature I have been thinking of implementing is the concept of one point cloud section occluding another. Meaning if you are staring at the points representing a wall , you shouldn't be able to see the points of other walls that are behind it. Note that I have no connectivity information just points with associated colors (and generating a mesh would be highly non-trivial).

If i know the general density of the point cloud i could estimate the occlusion provided by a point as a sphere or cube surrounding the point of a calculated radius. I know that would grow the silhouette of an object but that is ok. But how to cull by occlusion in real-time eludes me.

I found a site claiming their software can do this, but they don't explain how.

http://www.getlaserscanning.com/uncategorized/improving-visual-clarity-of-point-clouds-using-occlusion

Anyone have any thoughts?

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I have used hardware occlusion queries in the past. I just dont see how they could be used to provide occlusion culling to an unstructured point cloud.

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If you draw the closest point cloud first, then draw a simple polygon hull of the second point-cloud with an occlusion query, you can determine if you need to draw all the points of the second point-cloud.

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