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Returns a refraction vector using an entering ray, a surface normal, and a refraction index.
| ret refract(i, n, ?) |
|---|
Parameters
| Item | Description |
|---|---|
| i |
[in] A floating-point, ray direction vector. |
| n |
[in] A floating-point, surface normal vector. |
| ? |
[in] A floating-point, refraction index scalar. |
Return Value
A floating-point, refraction vector. If the angle between the entering ray i and the surface normal n is too great for a given refraction index ?, the return value is (0,0,0).
Type Description
| Name | Template Type | Component Type | Size |
|---|---|---|---|
| i | vector | float | any |
| n | vector | float | same dimension(s) as input i |
| ? | scalar | float | 1 |
| refraction vector | vector | float | same dimension(s) as input i |
Minimum Shader Model
This function is supported in the following shader models.
| Shader Model | Supported |
|---|---|
| Shader Model 2 (DirectX HLSL) and higher shader models | yes |
| Shader Model 1 (DirectX HLSL) | yes (vs_1_1 only) |