https://bugs.kde.org/show_bug.cgi?id=481418
Bug ID: 481418
Summary: Krita's Fisheye Assistant is using the wrong kind of
curves
Classification: Applications
Product: krita
Version: unspecified
Platform: Other
OS: All
Status: REPORTED
Severity: normal
Priority: NOR
Component: Tool/Assistants
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
Created attachment 165861
--> https://bugs.kde.org/attachment.cgi?id=165861&action=edit
Fisheye Perspective Curves are segments of Perfect Circles
Krita's Fisheye Assistant is using the wrong kind of curves.
The Fisheye Assistant is currently using ellipses for its curves. However, a
proper Fisheye Perspective can only be achieved by using segments of perfect
circle. In fact, Krita's Curvlinear Perspective Rulers is doing this the
correct way -- it makes sense too -- Fisheye perspective is just an application
of Curvlinear Perspective.
Although the effects of using ellipses and perfect circles might look similar,
ellipses only works for projecting spherical objects on a flat screen -- for
example, a photo of a globe. As such, it can only loosely mimic 1-point
dead-center Fisheye Perspective. If we increase the center points for more
complicated Fisheye Perspectives, this misuse of curves will prevent people to
understand how things works, and things fall apart.
A will attach a proper Fisheye Perspective guideline for reference.
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