[osg-users] How does PIXEL_SIZE_ON_SCREEN work

[Robert Osfield]

Hi Bruno,

On 17 May 2016 at 14:23, Bruno Oliveira <bruno.manata.oliveira at gmail.com> wrote:
> Thank you both. The problem I'm having is relative to the point clouds
> density: too dense clouds will result in poor rendering performance if I
> tune my LOD to render sparser clouds. I can't find a good trade-off for the
> LOD resolution that fits both cases. I will probably subclass the LOD class.

Rendering very large point data clouds is specialist problem with very
specific needs compared to rendering traditional polygonal scenes.  To
get the best results for your particular problem then coming up with
custom approaches may well be best.

One trick I've used in the past with point clouds is to trade point
size for point density - this works well when the point clouds
represent surface data such as collected by radar or laser scanning of
3D objects or environments.  If you have normal and colour data using
point sprites can work really well at filling in the gaps between
points, which in turn means you can get away with lower point density
and still have a compelling visual.

Robert.