All Questions
Tagged with vector-graphics math
58
questions
2
votes
1
answer
137
views
When to overload an operator in C++ as a member of a user-defined data structure and when not? I am completely lost
For any of you who can help explain to me when and when not to overload an operator as a member of a class or struct for example or not as a member, like global one.
The thing is that I am learning ...
- 23
1
vote
2
answers
51
views
I want to plot the route of a vector in a Lindenmayer system. How do I apply function to vector and get positions to plot?
This is my first question on stack overflow. I'm working on a script to plot a Lindenmayer-system. I already figured out how to do it by using the turtle package, but I would like to do it using ...
- 21
-1
votes
1
answer
164
views
Convert arbitrary grid of subpixel points to raster image
I hope you are doing well. I am stuck at one part of a visual effect program in C++, and wanted to ask for help.
I have an array of colors at random positions on an image. There can be any number of ...
- 131
0
votes
0
answers
85
views
Distance from point to conic bezier
I'm trying to rasterize a conic (rational quadratic) bezier, and came across this snippet: https://www.shadertoy.com/view/MlKcDD The idea is to calculate the distance from each fragment to the bezier ...
- 43
0
votes
0
answers
457
views
3d rotations defined by angles between original and new coordinate axes
This type of question has been asked before, but I haven't been able to find a satisfactory explanation. Perhaps I'm just a bit slow...
Say that I have a global right-handed coordinate system ...
1
vote
1
answer
832
views
How to Make Moving Sprite Point Toward Mouse in P5?
I was trying to make a program that pointed a sprite toward my mouse despite its displacement from the origin.
It rotates fine when it is at the origin, but obviously, when I start to move the sprite ...
0
votes
1
answer
100
views
Trim start and end points of straight line to where they enter/exit a rectangle?
I'm doing some canvas painting, and for performance reasons I want to get the coordinate of where a straight line enters and/or exits the screen.
To put it more simply, I want to find out the ...
- 18.2k
0
votes
1
answer
727
views
How to find 3D points coordinates in a perpendicular plane to a given vector
I have two points in a 3d space, one point is (x,0,z) and the other one is the origin (0,0,0), through those points there is a passing line with length L that is starting from the first point and ...
- 23
1
vote
2
answers
239
views
Algorithm to find the inner side of a polygon [closed]
Within my CAD-like application I have different kinds of 2D polygons. They can be concave or convex, and they can be drawn clockwise or counter-clockwise.
Now I want to find out where the inner side ...
- 6,135
0
votes
1
answer
704
views
Vector on upper half of hemisphere
I have a normal vector N, which defines the upper half of an hemisphere and an function, which creates random points P on the hemisphere.
Now I want to know, if the randomly choosen point is on the ...
- 15.6k
3
votes
1
answer
1k
views
Find center of circle defined by 2 points and their tangent intersection
I have Cartesian coordinates P, P0 and P1, how do I find C?
Note that C is also the orthocenter of the triangle which has P as a vertex and P0 and P1 as altitudes.
This code will run a couple ...
- 968
-1
votes
2
answers
1k
views
Vector Math with System.Numerics
I have the following code which rotates vectors and always keeps the result in the positive x,y,z plane.
I want to re-factor the code to use the System.Numerics type Vector3 and Matrix4x4.
Could ...
- 91
8
votes
2
answers
4k
views
Line offset (parallel lines) without cusps
I'm trying to draw lines with offset to main line like on attachment.
I have problems with my code. It generating intersections and cusps on the lines. (attachment)
Maybe someone can help me with ...
- 1,095
6
votes
2
answers
11k
views
How can I compute normal on the surface of a cylinder?
I am working on a ray tracer and I got around to adding cylinders to the scene. The point I am stuck at is finding the surface normal vector in the point the ray hits. I need this to be able to do the ...
- 157
0
votes
1
answer
111
views
Gets points from Vector3D and two lines from this point
I would like to get points between two lines, defined by a Vec3D point for origin, and angle from direction line. Since my english and my Maths are not good enough to explain, i drawn a picture :
In ...
- 1,156