How to set the point size in pixel units instead of actual size units?

[WangZP10969]

I am trying to display point clouds using vsg::points. I found that the size of the points is in actual units, that is, as the object scales, the size of the points will also change.

Is there a way to set the size of the points in pixel units? For example, always display a circle of 3 pixels in size.

[robertosfield]

The vertex shader would need to be changed to pass a constant size pixel I am away on a trip and replying from phone so can't provide more details.

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On Sat, 6 Jan 2024, 15:04 WangZP10969, ***@***.***> wrote: I am trying to display point clouds using vsg::points. I found that the size of the points is in actual units, that is, as the object scales, the size of the points will also change. Is there a way to set the size of the points in pixel units? For example, always display a circle of 3 pixels in size. — Reply to this email directly, view it on GitHub <#1064>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AAKEGUGKJFUWLRGD6YLTUJ3YNFRWNAVCNFSM6AAAAABBPTQKZ6VHI2DSMVQWIX3LMV43ERDJONRXK43TNFXW4OZWGAZTKMJRGE> . You are receiving this because you are subscribed to this thread.Message ID: ***@***.***>

[WangZP10969]

Thanks a lot for the hint, I modified brick.vert to implement the feature

//float dist = max(vsg_PointSize[1], abs(eyePos.z));
//vec4 viewport = viewportData.values[0];
//gl_PointSize = viewport[3] * (vsg_PointSize[0] / dist);
gl_PointSize = vsg_PointSize[0];