TMcolourblock (256 + 1024 * 4 bytes)
This contains all the colours used in the Gemini environment. They are stored separately, because Gemini recalculates them each time a user change graphic mode. The 1024*4 additional bytes are used to store a table of user defined lights. See later. Each colour entry uses 8 bytes; 4 for &BBGGRR00 of the colour and the second 4bytes to store the translated colour for the current graphic mode. The values inside [] are the default values set when you call Gemini_Initialise.
Once Gemini is running, if you want to change a colour (say the fog colour) just alter the relevant location with the new palette entry and then inform Gemini that you have changed colour by setting TMviewblock!156 to a value different from 0. Gemini will recalculate the new colour table next time a Gemini_Render call is issued and zeroes this location (+156) on exit.
Offset Meaning Default
+0 Background colour (or sky start,for shaded background) [&AA999900]
+8 Active plane colour [&00FFFF00]
+16 Active axis colour [&0000FF00]
+24 Fog colour [&AA999900]
+32 Sky end colour (if user wants a shaded background) [&FF000000]
+40 Ground start colour (if user wants a shaded background) [&BF444400]
+48 Ground end colour (if user wants a shaded background) [&00FF2200]
+56 Bezier visual-hull lines colour [&FFD53B00]
+64 Polygon vertices colour [&00FFA000]
+72 Bezier control points colour [&FF000000]
+80 Selected points colour [&0000FF00]
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