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

2 Nov 2015
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Updated 2 Nov 2015
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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?

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Image Analyst
Image Analyst on 2 Nov 2015
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 on 2 Nov 2015
Edited: hyun-woo on 2 Nov 2015
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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hyun-woo
hyun-woo
on 2 Nov 2015

Edited:

hyun-woo
hyun-woo
on 2 Nov 2015

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