[Radiance-general] Texture Mapping and colorpict usage

[Terrance Mc Minn]

I am at a loss to resolve why my texture mapping always come up square even
though the 'pic' file may have a aspect ratio other than 1 as in the example
below. 

I am using Radiance Version 3.8

I use the following procedure (Sketchup Pro V6 to 3ds units millimetres):
# 1. Convert the 'jpg' image to uncompressed 'tif'
#	convert -compress none texture.jpg texture.tif
# 2. Create a 'pic' image from the 'tif':
#	ra_tiff -r texture.tif texture.pic
# 3. Determine the average red green blue values of the 'pic' image
#	ximage texture.pic &
#	  Left click and drag a rectangle over a representative area of the
image
#	  Press the letter 'c' to display the values e.g. 0.02,0.45,0.36
# 4. Calculate the appropriate grey values e.g.
#	icalc /usr/local/lib/ray/lib/rayinit.cal
#	  grey(0.02,0.45,0.36)
#	  $1=0.330185114	printed by the icalc program
#	  ^C			Control C to quit the program
# 5. Copy/create the texture material as a plastic or trans material
#	Don't label the material with the final modifier name at this stage
#	The red green blue values should be the value of $1 calculated in
the last step
# 6. Create the colorpict entry to link the image and transformation size.
#	Size is always taken as the smallest dimension of the image is 1
unit.
# 7. Alias the colorpict and the material to the required modifier name

# size 1219 x 2438 This is the size reported with Sketchup for the use of
this image
void plastic Concrete_Form_4x8
0
0
5 0.423402293 0.423402293 0.423402293 0.000000 0.000000

void colorpict image_data_Concrete_Form_4x8
9 red green blue textures/Concrete.pic . frac(U) frac(V) -s 1219
0
0

image_data_Concrete_Form_4x8 alias Concrete Concrete_Form_4x8

ximage Concrete.pic shows the expected 1 to 2 aspect ratio.

getinfo -d Concrete.pic reports -Y 336 +X 168

I have tried varying the last line of colorpict stanza to add in an aspect
ratio e.g 1 0.5 or 1 2, neither made any difference.

Any thoughts would be appreciated.

Regards 

Terry Mc Minn
Faculty of Built Environment, Art and Design
Curtin University of Technology
GPO Box U 1987 Perth 6845
Western Australia
Email: T.Mcminn at curtin.edu.au
CRICOS Provider Code: 00301J 


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