I think I want the angle between -R and V but I'm not sure how to get R.

I am working on a Lua function that creates a TI Image of a 3D object made of triangles but I don't know how to determine what shade the pixel should be.
I have looked at some websites but they either didn't get into detail or they used notation or syntax I'm not familiar with.

This is the relevant information I have:
camera position
light source position
the points that make up the triangle
the equation of the plane the triangle lies in
point where the camera view intersects the plane
the original color of the triangle

If anyone understands how Phong shading (or something similar) works, explaining it at a precalculus level would be much appreciated.

Something like this is what I am thinking of but I don't know how it works.


I know about vectors but I don't understand what R is.

Thank you

If that's the case then I'm glad I didn't try to send it to my calculator.

Does anyone know what the function image.__gc does? When I try to paste code including image.__gc() into the student software, the software closes. I have no idea what this function does. There isn't anything useful in the mere 87 results I had on Google when I searched "image.__gc". When I searched __gc most of it was C++ stuff.

Thanks for the peanuts yunhua98 but I know better than to click on links that go to starcraft.swf

As for Lua, I am currently reading a book and some tutorials to learn the basics. When I get to Nspire Lua I'll defiantly go to http://www.inspired-lua.org.

I'm aware of IRC but I've never actually used it. I've seen the logs of the channel and I once found it on efnet.org so I kind of understand how it works.

No. Should I register? I don't know very much about ticalc.org. What advantages does it have over Omnimaga?

Thank you for the welcoming greetings and for the peanuts.

If I have any questions I'll ask.

P.S. I noticed while registering that the rules on the register page don't match the rules on the rules page