5 replies to this topic

[Yang G]

Hi
I'm  writing some code to implement the sphere mapping , But I can't understant the theory  from the limit imformation got on the net.
can someone give me some  clews , documents or links about the details of sphere mapping.
if you have some documents about it, I'll  appreciate you can mail me. my email is pinner@mail.ustc.edu.cn.

Thanks in advance

[Yang G]

??

[Hodgman]

http://en.wikipedia..../Sphere_mapping

Which parts are you having trouble with?

Do you have to generate sphere maps, do you have to use existing sphere-maps to implement environment-mapping, or both?

Which graphics API are you using? Are you using shaders?

What have you tried so far? What sources of information have you used so far?

Is there a reason you want to use sphere-mapping instead of other techniques, such as cube-mapping?

[Jason Z]

Have a look at this article - it will show you the details of sphere mapping, along with a comparison of cube mapping, dual paraboloid mapping, and sphere mapping:

Programming Vertex, Geometry, and Pixel Shaders - Single Pass Environment Mapping

[rouncer]

sphere mapping is just taking the normal, multiplying it by the view matrix, and then reading the x and y coordinate of the normal as a uv coordinate, the map you use is a fishbowl of an environment, and it makes the object look shiny. theres lots of ways to do it tho, theres different versions, and make metallic objects.

[Yang G]

Thx

I just want to learn the theory of sphere-mapping and implement it by C++ program. I have implemented the cube-mapping ;-)
I will check the link posted by Jason Z.