what is the "Surface spread exponent" in specular function?

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hyun-woo
hyun-woo 2015-11-2
编辑： hyun-woo 2015-11-2
I want to calculate reflectance using the function "specular". There is "Surface spread exponent". But I don't understand What is "Surface spread exponent"? So, I want to know how dose the "specular" function calculate the specular reflectance? Are there any formula or reference paper?
  2 个评论
Image Analyst
Image Analyst 2015-11-2
Never heard of it. Do you mean Point Spread Function? Or does it have anything to do with the Bidirection reflectance distribution function?
hyun-woo
hyun-woo 2015-11-2
编辑：hyun-woo 2015-11-2
Yes, It is related to BRDF. but I can't know what is "Surface spread exponent" parameter in specular function
r = specular(nx,ny,nz,s,v,k)
k is "Surface spread exponent" parameter.
The "specular" function is in MATLAB -> Functions ->3-D Visualization -> Lighting

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