# Tagged Questions

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### Inward-pointing normal and co-ordinate systems

I'm doing a course in computer graphics, and as such, we're being taught measures on how to deal with the Hidden Surface Removal problem. One of the topics covered was "back-face detection", that is, ...
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### Expressing vectors in an octagon

I'm having trouble with this question in my course. I am to consider a regular octagon with vertices A, B, C, D, E, F, G and H in counter clockwise order. The vectors $\overrightarrow{AC}$ and ...
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### Find self-avoiding-filling-polygon represented by system of linear equations

In Euclidean graph where each vertex is a point on the $2D$ plane, so the weight of each edge is the Euclidean distance between the vertices. I want to find self-avoiding-filling-polygon from my graph ...
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### How to determine whether a line is at the clockwise side of another line?

This is my first post in math-overflow , I am trying to implement an algorithm where , i am given 2 lines , two lines have one point in common , i need to determine if one line is at the clockwise ...
Let $x,n$ be 2 integers with $x<n$. I need to find the vertices of the polytope $P$ of $2 \times n$ nonnegative matrices $A$ such that: The first row in $A$ is summed to $x$. \sum_{j=1}^n ...