8.6 The zfile display driver
A `zfile' contains depth information for each pixel in the image and is meant to build a shadow map. The format of a `zfile' is described in Table 8.2.
| Offset | Type | Name | Description
|
| 0 | int32 | magic | Typically 0x2f0867ab. Reading 0xab67082f means that swapping "endianness" in the entire file is necessary.
|
| 4 | short | xres | The x resolution in pixels.
|
| 6 | short | yres | The y resolution in pixels.
|
| 8 | float[16] | Np | World to Normalized Device Coordinate transformation matrix, in row major order.
|
| 72 | float[16] | Nl | World to Camera matrix, in row major order.
|
| 136 | float[xres*yres] | z data | Top to bottom, left to right ordering.
|
Table 8.2: `zfile' file format. |
To build a shadow map using a zfile, use "tdlmake `-shadow'" as described in Using the Texture Optimizer - tdlmake or issue a RiMakeShadow command in a RIB file.
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