[Radiance-general] Texture Mapping and colorpict usage

[giulio antonutto]

hope here you can find something useful:
http://web.mac.com/geotrupes/iWeb/Main%20site/RadBlog/3690C181-7F9F-43AD-B5B
2-A5D239AD503E.html
and if you use obj2mesh... remember that the mesh need to be regenerated at
any change since it is frozen...
ciao
G.



On 1/6/07 16:28, "Terrance Mc Minn" <t.mcminn at curtin.edu.au> wrote:

> 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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