LiSkyRadiance
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| Function | LtStatus
| LiSkyRadiance( |
LtShader | sky_shader | | |
LtDouble | altitude | | |
LtDouble | azimuth | | |
LtFloat | *radiance | | |
) | |
|
| Synopsis |
Interrogate a sky light source shader and find the radiance for a
given altitude and azimuth.
|
| Location | lishpro
|
| Parameters |
| sky_shader | The sky light source to interrogate |
| altitude | The altitude of the point of interest |
| azimuth | The azimuth of the point of interest |
| radiance | The returned radiance value |
|
| Return Value |
LI_STATUS_OK on success, other status value if something
goes wrong or the input is invalid.
|
| Description |
The sky light source shader passed as input is interrogated to find
out what its radiance value is at the altitude and azimuth angles
specified. Note that azimuth values are clamped in the range 0 to
360 degrees and altitude angles in the range 0 to 90 degrees. If
angles outside these ranges are specified then a diagnostic will be
issued informing the actual value being used by the function.
|
| Example |
LtShader sky_shader = LiShaderCreate( LI_SHADER_CLASS_LIGHT, "sky" );
LtColour radiance;
LtDouble altitude = (LtDouble)45,
azimuth = (LtDouble)180;
LtStatus status = LI_STATUS_OK;
status = LiSkyRadiance(sky_shader, altitude, azimuth, radiance);
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| See Also |
No links available here.
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