refract - HLSL
Returns the refraction vector given the entering ray direction i, the surface normal n, and the refraction index ri. If the angle between i and n is too great for a given eta, refract returns (0,0,0).
Syntax
Where:
| Name |
In/Out |
Template Type |
Component Type |
Size |
| i |
in |
vector |
float |
any |
| n |
in |
vector |
float |
same dimension(s) as input i |
| ri |
in |
scalar |
float |
1 |
| refraction vector |
out |
vector |
float |
same dimension(s) as input i |
Minimum Shader Version
This intrinsic function is supported in the following (or above) shader versions:
| Vertex Shader |
Pixel Shader |
| vs_1_1 |
ps_2_0 |
See Also
HLSL Intrinsic Functions
