eval_bsdf

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vector  eval_bsdf(bsdf b, vector viewer, vector light, ...)

vector  eval_bsdf(bsdf b, vector viewer, vector light, int mask, ...)

vector  eval_bsdf(bsdf b, vector viewer, vector light, float &pdf, int mask, ...)

vector  eval_bsdf(bsdf b, vector viewer, vector light, vector normal, ...)

vector  eval_bsdf(bsdf b, vector viewer, vector light, vector normal, int mask, ...)

vector  eval_bsdf(bsdf b, vector viewer, vector light, vector normal, float &pdf, int mask, ...)

b

BSDF to evaluate.

viewer

Vector toward viewer.

light

Vector toward light.

normal

Surface normal.

mask

A bitmask indicating which types of shading component bounces to evaluate.

See bouncemask for information on component label bitmasks.

&pdf

The function overwrites this variable with the computed PDF for the given directions, scaled by the albedo.

Variadic arguments

variadic-arguments

The eval_bsdf function passes any extra "name", value argument pairs to the BSDF being evaluated. For custom BSDFs these keyword arguments are bound to shader arguments (e.g. indicating whether the BSDF is being evaluated for direct or indirect illumination). It’s also possible for a BSDF to pass information back to eval_bsdf. To indicate that a keyword argument value should be imported from the BSDF prefix the keyword with “import:”

Examples

examples

v = eval_bsdf(F, inI, dir,
    "direct", 0,                        // Specify indirect illumination
    "import:sssmfp", sssmfp,        // Read the exported sssmfp parameter
    ...
);