Grid orientation effect in volume rendering of HRRPUV

[rmcdermo]

Something seems not quite right with HRRPUV. There is a noticeable grid effect where it looks like I am viewing slices instead of volume rendering. This seems to happen with or without smoke. The case in question is in this test director on burn.

/home4/rmcdermo/Issues/Eric_M/

[rmcdermo]

This is with SMV-6.8.0-2080-gd3d300ce6-test

[gforney]

3D HRRPUV is drawn as multiple slices with the orientation determined by your view direction. the actual slices in this case are more noticeable because the 50% opacity depth is set at 0.3 m and the grid size (distance between slices) is 1 m so each HRRPUV slice is essentially opaque - alpha = (1 - .5^(1/0.3)) ~ 0.9 . To make this grid orientation effect less noticeable increase the 50% opacity depth to say something like 1.0 m

[rmcdermo]

Sorry. I don't think this makes the problem less noticeable... just seems to make the slices fainter.

If you think this looks ok, then feel free to close. But I think we should think about how to improve this for large domains with coarse grids.

[gforney]

I will see if I can make it look better.

…

On Tue, Mar 12, 2024 at 11:02 AM Randy McDermott ***@***.***> wrote: Sorry. I don't think this makes the problem less noticeable... just seems to make the slices fainter. If you think this looks ok, then feel free to close. But I think we should think about how to improve this for large domains with coarse grids. — Reply to this email directly, view it on GitHub <#1831 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AC6UCRXSSUE7K2GEWRGNEHDYX4KHRAVCNFSM6AAAAABEQTPPZKVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMYTSOJRHA3DCMBQG4> . You are receiving this because you were assigned.Message ID: ***@***.***>

-- Glenn Forney