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As mentioned, tdlmake has been designed to adapt very well to huge textures. One exception is compressed TIFFs that have a large "rows per strip" value. Here is an example output of tiffinfo on a large texture file that can cause problems for tdlmake:
% tiffinfo earth.tif Image Width: 43200 Image Length: 21600 Resolution: 72, 72 (unitless) Bits/Sample: 8 Compression Scheme: AdobeDeflate Photometric Interpretation: RGB color FillOrder: msb-to-lsb Software: "ImageMagick 5.5.7 07/22/03 Q16 http://www.imagemagick.org" Document Name: "earth.tif" Orientation: row 0 top, col 0 lhs Samples/Pixel: 3 Rows/Strip: 21600 Planar Configuration: single image plane Predictor: horizontal differencing 2 (0x2) |
There is only one strip, made of 21600 (total image height) rows. This means that accessing any scanline in this TIFF forces the TIFF reading library to uncompress the entire file(12). In order to lower memory usage for such large files, it is suggested that a lower "rows per strip" count be used. Typically, 16 or 32 scanlines is a good choice. tdlmake
prints a warning if it encounters a file that has the aforementioned problem:
tdlmake: warning, reading texture 'earth.tif' may take a large tdlmake: amount of memory. Please refer to user's manual if you are tdlmake: unable to convert this file. |
Here are some examples using tdlmake
on the command line:
To create a texture named `grid.tdl' from a TIFF named `grid.tif' using a gaussian downsampling filter of width 4:
tdlmake -filter gaussian -filterwidth 4 grid.tif grid.tdl |
To create a cubic environment map in which all cube sides were rendered using 90 degrees field of view:
% tdlmake -fov 90 -envcube \ in1.tif in2.tif in3.tif in4.tif in5.tif in6.tif \ envmap.tdl |
or (won't work in a DOS shell) :
tdlmake -fov 90 -envcube in?.tif envmap.tdl |
To create a texture using the high quality downsampling mode and show progress while doing so:
tdlmake -progress -quality high grid.tif grid.tdl |
To create a shadow map from a zfile (The zfile display driver):
tdlmake -shadow data.z shadowmap.tdl |