> i've read the modenc and the docs here on these formats

What's modenc?

> i however can't seem to get it right.

> could anyone here explain this :

> i believe spans are basically the voxel data of a 1x1xvoxelheight columns , am i right?

> +------------------+
> � SKIP COUNT � 1 byte *can you explain this one? my guess is that this is the amount of empty voxels in the column before non-transparant/empty voxels show up.
> +------------------�
> � NUM. VOXELS � 1 byte *i assume this is the number of voxels contained in the span ?
> +------------------�
> � VOXEL 1 COLOUR � each 1 byte; palette colour index
> +------------------�
> � VOXEL 1 NORMAL � each 1 byte
> +------------------�
> � VOXEL 2 COLOUR �
> +------------------�
> � VOXEL 2 NORMAL �
> +------------------�
> ...
> +------------------�
> � VOXEL n COLOUR �
> +------------------�
> � VOXEL n NORMAL �
> +------------------�
> � NUM. VOXELS � 1 byte; same value as previous declaration
> +------------------+

Looks right.

> then onto shp compression 3

> excerpt from banshee's modenc article :
> "
> The compression 3 is quite easy to be understood. The colour #0 repeats many times in a SHP file, since it's the background (transparent) colour. Therefore for any instance of the colour #0, the next byte will be the ammount of times (until 255) that #0 repeats. Another thing that must be considered on the compression 3 is that the first 2 bytes of a line are not colours. They indicate the size (in bytes) of the line.

> The compression 2 works similarly to compression 3, but there is no special treatment for colour #0."

> right, every time you get a color index 0 byte, the next byte will say how often it repeats.
> however, the first 2 bytes of a line that say how long it is ...what the hell is a line supposed to be in a shp ?

A horizontal (scan)line of pixels.

Olaf van der Spek

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