+- AB4D Forum (https://forum.ab4d.com)
+-- Forum: Products Forums (https://forum.ab4d.com/forumdisplay.php?fid=4)
+--- Forum: Ab4d.SharpEngine (https://forum.ab4d.com/forumdisplay.php?fid=12)
+--- Thread: PixelsNode - Get Closest Position (/showthread.php?tid=4490)
PixelsNode - Get Closest Position - ethang - 08-27-2025
Hello,
I am using PixelsNode to display a point cloud. I would like to use the middle mouse button to update the TargetPosition of the TargetPositionCamera, however, I can't find a good way to find the closest Vector3 point based off a ray. I've looked through the samples and didn't find anything that fit what I was looking for but maybe I missed it.
With DXEngine and PowerToys, I used the GetClosestPositionIndex in the OptimizedPointMesh class to do this.
Thanks for the assistance.
RE: PixelsNode - Get Closest Position - abenedik - 09-22-2025
Ab3d.a DXEngine also supports rendering VertexId bitmap that is in most cases even faster than using OptimizedPointMesh - see the "Ab3d.DXEngine hit testing / Using VertexId Bitmap" sample.
But Ab4d.SharpEngine supports neither OptimizedPointMesh nor VertexId bitmap for point clouds.
However, adding support for VertexId bitmap can be implemented quite easily. If you want, then I may be able to prepare a new pre-release version of Ab4d.SharpEngine with that for you. First, I need to release the first web version of Ab4d.SharpEngine, then I can start working on that feature. Maybe you can already get a new pre-release version next week.
RE: PixelsNode - Get Closest Position - ethang - 09-24-2025
Thanks for the message.
It's not an urgent feature need for me at the moment as I have other development items taking up my time. I think if you can work it into the next Ab4d.SharpEngine release that should be fine.
Thanks again.
RE: PixelsNode - Get Closest Position - abenedik - 10-01-2025
I have sent you an email with the link to the pre-release version with support for PixelsNode hit-testing.
The new sample is available on the development branch - https://github.com/ab4d/Ab4d.SharpEngine.Samples/blob/development/Ab4d.SharpEngine.Samples.Common/HitTesting/PointCloudHitTestingSample.cs