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Fix GPv3 conversion 'thickness adjustment' not clamping radius to 0. #120840

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Falk David merged 1 commits from mont29/blender:tmp-gpv3-conversion-radius-modifiers into main 2024-04-22 15:03:17 +02:00
Conversation 3 Commits 1 Files Changed 1 +13 -2
Bastien Montagne commented 2024-04-19 19:08:20 +02:00
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Legacy GPv2 code seems to clamp the final computed radius to 0 (at
least in some cases, see e.g. line 3992 in
gpencil_stroke_perimeter_ex).

Add a clamping node to the generated geometry node used to mimmic the
legacy thickness adjustment in GPv3 converted data.

NOTE: There are still some artifacts in testfile used to investigate
this issue ((Anim) 10 Picknick by Susanne Weise.blend), that looks
like invalid radius handling on some curves ends... Clamping may be
needed in other places maybe?

GPv2, blender 4.0-saved testing file (modified from original):

GPv2 as rendered by 4.0 release:

image

GPv3 as rendered by current main:

image

GPv3 as rendered by this patch:

image

Difference between 4.0/gpv2 render and main/gpv3 render:

image

Difference between 4.0/gpv2 render and this PR/gpv3 render:

image

Legacy GPv2 code seems to clamp the final computed radius to `0` (at least in some cases, see e.g. line 3992 in `gpencil_stroke_perimeter_ex`). Add a clamping node to the generated geometry node used to mimmic the legacy thickness adjustment in GPv3 converted data. NOTE: There are still some artifacts in testfile used to investigate this issue (`(Anim) 10 Picknick by Susanne Weise.blend`), that looks like invalid radius handling on some curves ends... Clamping _may_ be needed in other places maybe? ----------------- GPv2, blender 4.0-saved testing file (modified from original): GPv2 as rendered by 4.0 release: ![image](/attachments/26eb1dc1-39df-49a7-911b-560d53abe969) GPv3 as rendered by current main: ![image](/attachments/7bd1ac81-07ed-46d0-9450-73ab957a78c2) GPv3 as rendered by this patch: ![image](/attachments/7309039b-9352-4815-bef8-bd141245dffc) --------------- Difference between 4.0/gpv2 render and main/gpv3 render: ![image](/attachments/3e5080d1-ecc2-429c-a1ef-cd29aee65bfb) Difference between 4.0/gpv2 render and this PR/gpv3 render: ![image](/attachments/14f33b4d-a782-4a9a-9ba2-b8b04eb5620f)
image.png
246 KiB
(Anim) 10 Picknick by Susanne Weise.blend
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Bastien Montagne added 1 commit 2024-04-19 19:08:31 +02:00
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52ac3aa717 Fix GPv3 conversion 'thickness adjustment' not clamping radius to 0. 
Legacy GPv2 code seems to clamp the final computed radius to `0` (at
least in some cases, see e.g. line 3992 in
`gpencil_stroke_perimeter_ex`).

Add a clamping node to the generated geometry node used to mimmic the
legacy thickness adjustment in GPv3 converted data.

NOTE: There are still some artifacts in testfile used to investigate
this issue (`(Anim) 10 Picknick by Susanne Weise.blend`), that looks
like invalid radius handling on some curves ends... Clamping _may_ be
needed in other places maybe?
Bastien Montagne commented 2024-04-19 19:24:07 +02:00
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@blender-bot build

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Bastien Montagne requested review from Lukas Tönne 2024-04-19 19:28:46 +02:00
Bastien Montagne requested review from Falk David 2024-04-19 19:28:46 +02:00
Bastien Montagne added this to the Grease Pencil project 2024-04-19 19:28:53 +02:00
Lukas Tönne approved these changes 2024-04-20 09:19:45 +02:00
Bastien Montagne force-pushed tmp-gpv3-conversion-radius-modifiers from 52ac3aa717 to 2aa1a1e488 2024-04-20 17:23:07 +02:00 Compare
Bastien Montagne commented 2024-04-20 17:23:23 +02:00
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Bastien Montagne commented 2024-04-22 09:29:15 +02:00
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NOTE: there may be other places that need clamping thickness/radius to 0 too (looking at some remaining artifacts in PR render above, compared to 4.0/GPv2, e.g. the tip of some of the grass strokes...).

NOTE: there may be other places that need clamping thickness/radius to 0 too (looking at some remaining artifacts in PR render above, compared to 4.0/GPv2, e.g. the tip of some of the grass strokes...).
Falk David approved these changes 2024-04-22 12:15:01 +02:00
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Thanks for looking into this!

Thanks for looking into this!
Falk David merged commit fc08f7491e into main 2024-04-22 15:03:17 +02:00
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