[Radiance-general] glow&spotlight material

[Martin Moeck]

The fourth argument can be set to 0. It is important to crank up the rpict ambient calulcation or you will miss the glow source, because it can only be caught by -ad and -as rays
 
rpict -ab 1 -ad 8000 ... 
 
Dr. Moeck

	-----Original Message----- 
	From: WOOK JEA OH [mailto:wxo110 at psu.edu] 
	Sent: Sun 4/25/2004 4:17 PM 
	To: radiance-general at radiance-online.org 
	Cc: 
	Subject: [Radiance-general] glow&spotlight material
	
	

	Hi, This is woogie.
	
	I am trying to study material characteristic in Radiance by using Desktop
	Radiance in the DOS mode.
	
	I have some problems with glow and spotlight material.
	
	I made a simple scene with only two surfaces facing each other.
	One of surfaces is light source and the other is plastic.
	the plastic surface (1x1m) is 5m apart from the light source material(1x1m)
	
	And I plugged in different light source material to see if there is differernt.
	
	Light and illum material result in the same illuminance value as that by hand
	calcuation.
	
	When it comes to glow material, it seems to me odd.
	The first, It is said that the fourth argument, maxrad in the glow material can
	be negative, zero, and positive.
	
	When the fourth argument is zero, illuminance value on the floor(1x1m) which is
	5m apart from the glow material(1x1) is not uniform.
	
	Light amd illum material result in the uniform illuminance value on the floor
	with the same geometry material setting.
	
	It seems to me that rendering parameter might not correct because the center of
	the floor is darker than the edge of the floor or it comes from Desktop
	Radiance or it is because I did not understand the fourth argument in the glow
	material.
	
	If anyone knows of my problem, please let me know.
	I am linking a file below
	
	http://www.personal.psu.edu/users/w/x/wxo110/radiance.htm
	
	I appreciate any comment about it.
	Thanks!
	
	>From woogie.
	
	
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