7 replies to this topic

[Psycho_Gamer]

I've been stumped on how I can go about creating an object that looks like glass. No matter what I do, I always get a solid colour. Any hints?

[Reedbeta]

Google for refraction and Snell's law.

[Psycho_Gamer]

Reedbeta said:

Google for refraction and Snell's law.

Yeah, I have been trying refraction, but I think I might have the formula for my refraction ray direction in correct. On my sphere, i currently get a ring that looks transparent, while the inside is solid.

[Reedbeta]

Try working out the vectors on paper for a simple scene, using your formula, and check that everything looks like it's going the right direction. There are different sign conventions in use for the incident ray and refracted ray, so you might have a formula that doesn't match your program.

[roel]

And if Reedbeta's solution fails, and you are unsure about your formula, this might help.

[Psycho_Gamer]

Thanks folks.

[anubis]

and there is always the excellent raytracing article series here at devmaster :

http://www.devmaster...eries/part3.php

[Psycho_Gamer]

anubis said:

and there is always the excellent raytracing article series here at devmaster :

http://www.devmaster...eries/part3.php

Yup, I got it using that :D