3d angles

[NightSkyAurora]

Greetings everyone

I decided to continue with this project. I know that there is libraries out there to help me but I want to create my own one mostly for the fun of it and to get a better understanding of how it works.

I'm currently stuck on applying light to a surface. I want to create a light source at a target location and make nearby surfaces brighter according to the angle between the light source, surface and camera. Can anyone please help me out with the math to do it?

Anyway here is a new version of the program - needs MS visual studio '10+ to compile.

 

[GhostWolf]

You have issues with your perspective calculations.

As to shading, starting with blinn-phong is not too complicated.

 

[NightSkyAurora]

Wow thanks that is just what i needed! ... and what do you mean I have issues with my perspective calculations?

 

[GhostWolf]

Look at the way the scene gets distorted as it gets close to the borders of the window. You are not applying perspective properly.

 

[NightSkyAurora]

Oh.. that XD... the ToScreen function in the camera class is responsible for that. It is logicly accurate imo. I believe it's because the screen is narrower than your actual eyesight, therefore everything is "compressed" in the center so you can see a wider area on a not-so-wide screen. I'm not sure how some programmers fixed that though. This can be countered by tweaking the Z-factor.

 

[GhostWolf]

You need to apply the same operations as a perspective projection transformation.

Here's a quite in-depth tutorial thingy about the subject (targeted at OpenGL, but the information is there either way).