https://bugs.documentfoundation.org/show_bug.cgi?id=131604
Bug ID: 131604
Summary: 3D rotation object with end angle has curious fill for
front polygon
Product: LibreOffice
Version: Inherited From OOo
Hardware: x86-64 (AMD64)
OS: Windows (All)
Status: UNCONFIRMED
Severity: normal
Priority: medium
Component: Draw
Assignee: libreoffice-bugs@lists.freedesktop.org
Reporter: rb.hensc...@t-online.de
Created attachment 159051
--> https://bugs.documentfoundation.org/attachment.cgi?id=159051&action=edit
Collection of 3D rotation shapes
Open attached document. It has some 3D rotation objects. They all have the same
gradient as area fill and the same texture projection setting "object
specific". They differ in the end angle of the rotation.
The "back"-polygon, that one at angle 0°, shows always the same fill as the
generating shape. That is expected. But the "front"-polygon, that one at the
end angle, show various fillings. There is no rule visible, why they look this
way.
I can image two kind of behaviors
A) Always map the texture the same way to the "front"-polygon. That would be
easy to understand. But if end angle comes near to 360°, the fill would look
mirrored compared to polygon at 0°.
B) Map the texture mirrored to the "front"-polygon and keep it that way for all
angles. That would correspond to extrusion, where texture on front-face and
back-face are mirrored too. So at any angle, the blue part would be top-left
and the yellow part bottom-right in the example.
Especially confusing are jumps in the texture mapping, e.g. from 225.0° to
225.1°.
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