Questions tagged [bezier-curve]
43 questions
5
votes
1 answer
Bicubic bezier surface from 4 bezier curves
In the program I need to create, the user should specify the hull geometry of an aircraft wing and fuselage using cubic bezier polycurves.
But to get to m bezier patch surfaces the user would need to introduce 4 * m additional control points. It's…
ProdoElmit
- 151
- 3
3
votes
2 answers
Checking the correct offset direction for Bezier curve offset
I am implementing Bezier curve offset.
My approach is simple:
Given the handles, calculate the vectors normal to them
Move the handle along the normal vector.
If the new curve intersects the old one, reverse the offset direction.
etc.
I would like…
user1790813
- 131
- 1
2
votes
2 answers
What is the mathematics behind inkscape's power stroke path effect interpolator_type and interpolator_beta attributes?
Inkscape has a feature called Power Stroke which is a form of path effect. When you apply it to a stroke you gain 3 control points that allow you to adjust the thickness of the stroke. (I have not yet figured out how to add more control points…
Mutant Bob
- 151
- 2
2
votes
1 answer
Join two bezier curves so that the result is two-times continuously differentiable
I have a task to join two bezier curves, so that the resulting curve is two-times continuously differentiable.
I have the cubic bezier Curve C with control points:
c0 = (1,1)
c1 = (3,4)
c2 = (7,5)
c3 = (8,2)
I shall continue this curve C with Curve…
DeDo
- 21
- 2
2
votes
1 answer
Algorithm to add a path point, preserving path shape?
I'm using paper.js and need to add a point to a curved path without affecting the path's shape. Inkscape's "Edit paths by nodes" tool has this feature by default -- double-clicking on a path adds a node, adjusting the handles of the new node and…
Rick Mohr
- 141
- 3
1
vote
1 answer
Cubic Bezier Curve - General Questions
A bezier curve B(t) has 4 control points P0 = (0,0,0) , P1 = (1,0,0), P2 = (1,1,1) , P3 = (0,1,1). Which of the following are correct:
a) B(-2) is not defined
b) B(-1) = (-1,-1,-1)
c) B(t) , t in [0,1] is in the plane that P0,P1,P2 define.
I don't…
Emily Serone
- 13
- 3
0
votes
2 answers
Methods for filling the area between complex curves
I'm looking for algorithms or methods suitable for filling the area enclosed between complex curves - for example, the area within an outer ellipse but outside an inner ellipse, or the area bounded by two or more Bezier curves.
I'm familiar with the…
Saku
- 101
0
votes
0 answers
Dealing with selection of spline/bezier curves in graphical software
In 2d and 3d environment we can select primitives like lines and polygons by performing point/ray intersection test with the respective primitive. However how does one approach the selection of quadratic/cubic spline curves?
Is this problem often…
Lenny White
- 516
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