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0 votes
2 answers
1k views

How to calculate vertex normals on a mesh with non-planar polygons

If I have a mesh consisting of polygons that are not necessarily triangles and not necessarily planar. As answered in the previous question I asked, there's no correct answer to calculating normals ...
Lenny White's user avatar
0 votes
1 answer
323 views

OpenGL Polygon Offset Fill implementation example code

I am working on a pure java implementation of OpenGL 1 called jGL. I am missing glPolygonOffsetFill and am looking for an example implementation in java, c/c++ example of this GL function in order to ...
Martin Pernollet's user avatar
1 vote
1 answer
6k views

Drawing a square using glDrawArrays with GL_TRIANGLES

I used a version of the following code to draw a triangle using glDrawArrays with GL_TRIANGLES, per Anton Gerdelan's very nice tutorial here: Hello Triangle ! It draws a nice triangle. I have modified ...
Simon's user avatar
  • 213
3 votes
0 answers
89 views

What is a good algorithm, and framework, to calculate centres of gravity or mass (cog)?

I'd like to take an photograph, subdivide it into a tesselation, either of squares, or (ideally), hexagons, and then find the centre of gravity (or, if you prefer, centre of mass) of each cell of the ...
Peter Brooks's user avatar