Desktop radiance:materials,maps and lamps

Hi, I'm using Desktop Radiace2.0 and i have some questions:

1- where I can find properties(reflectance,roughness,transmittance,specularity)of:
brick,stone like travertin.I saw that there is a directory "Radiance/lib/lib/material.rad"
where there are some materials no including in material library of desktop
radiance.How can I import this in desktop radiance?..Do I use material manager
or replace only copy the file of material somewhere..and where?

2- I have a floor like chees-board, I can use a map (if yes, how?) or I
have make each 3dface?this question is the same for a wall of brick and
a picture in format jpeg.

3- i don't understand how use luminaire manager...i have to create my lamp
in autocad(when do i assign material's lamp'),then insert is format,but
can I use a lamp that is in luminarie library and only change ies format?if
yes,how is the procedure?

Thank for help
Dario

I'm not a Desktop Radiance user - just Radiance - so I could be wrong - but
since this has not been answered, I'll try

2- I have a floor like chees-board, I can use a map (if yes, how?) or I
have make each 3dface?this question is the same for a wall of brick and
a picture in format jpeg.

You can use a map - but not from a jpeg - it should be in Radiance .pic
format
change your jpeg to tiff, then you can convert from tiff to pic with
ra_tiff -r chess.tif > chess.pic
this is a sample mapped material
assuming you have a pic named chess.pic

void colorpict mappedfloor
13 red green blue chess.pic /usr/local/lib/ray/picture.cal tile_u tile_v -s
2.5 -t 2 4 0
0
1 1

In the above example, you are defining a material named mapped floor
13 is the number of arguments to follow
use the RGB info from chess.pic
apply it with picture.cal
tile the picture
scale it 2.5 times
translate it 2 on x and 4 on y
if you want it on a wall, rotate it on x axis -- you'd add -rx 90 and
change the 13 to 15 (added 2 more arguments)
0 - expect no argument here
1 argument to follow 1 is the hieght/width ratio of your image (its a
square)
if your image was a 3:4 ratio it would be
1 .75

Sorry - can't answer the other Q's

Rob Fitz

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