Java中的3D转换

Question

I have to write a program which draws lots of triangles. I have got 3D-coordinates but I want to draw them in 2D. My problem is that I am not understanding how I can transform the coordinates and the websites I found never had got an example, so eg I got A(3|1.5|-0.5), B(4|2.5|-1) & C(5|1|-1.5) and I am standing ad ViewingPoint(4|2|10). What are the new coordinates and how I get them?

Answer 1

Basically, you would do this like that :

u = x/z; //u is your x in 2D
v = y/z; //v is your y in 2D

• u and v are your new coordinates in 2D for a specific point
• and x, y and z are your old 3D coordinates for that point

I am adding this link to my answer as this is the math behind my answer : https://en.wikipedia.org/wiki/3D_projection?oldformat=true