Difference between revisions of "Sonic Jam"
From Sonic Retro
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(Changed 3D Vectors and Euler Angles explanations to the more generic Fixed Point Numbers and Angles.) |
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Pieces of the guide not big enough for their own page should be left here. | Pieces of the guide not big enough for their own page should be left here. | ||
| − | === | + | ===Fixed Point Numbers=== |
| + | A fixed point number is how fractional numbers were handled in most games in this era, as opposed to floating point numbers. | ||
| − | + | In Sonic Jam, a fixed point number consists of two words. The upper word is the integer part, while the lower word is the fractional part, out of 65536; there's essentially a decimal point between the two words. For example, 1.0 would be written $0001 0000, whereas 0.5 would be written $0000 8000, 0.25 would be $0000 4000, and so on. | |
| + | |||
| + | Negatives are handled just like integers. This means that -1.0 would be written $FFFF 0000, whereas -0.5 would be $FFFF 8000, -0.25 would be $FFFF C000, and so on. | ||
| + | |||
| + | ===Angles=== | ||
| + | Angles in this game appear to always be words, where 0 degrees is $0000, 90 degrees is $4000, 180 degrees is $8000, and so on. | ||
| + | |||
| + | ==External Links== | ||
| + | * [https://antime.kapsi.fi/sega/docs.html Antime's Sega Saturn Documentation Page] | ||
==References== | ==References== | ||
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<references /> | <references /> | ||
{{SCHGuides}} | {{SCHGuides}} | ||
[[Category:Sonic Community Hacking Guide]] | [[Category:Sonic Community Hacking Guide]] | ||
Latest revision as of 10:04, 22 November 2022
| SCHG: Sonic Jam |
|---|
| Main Article |
| Sonic World |
This is the Sonic Community Hacking Guide for Sonic Jam.
Contributors
(In alphabetical order; if you are a contributor and have worked on a specific part of the guide, feel free to note that.)
Miscellaneous
Pieces of the guide not big enough for their own page should be left here.
Fixed Point Numbers
A fixed point number is how fractional numbers were handled in most games in this era, as opposed to floating point numbers.
In Sonic Jam, a fixed point number consists of two words. The upper word is the integer part, while the lower word is the fractional part, out of 65536; there's essentially a decimal point between the two words. For example, 1.0 would be written $0001 0000, whereas 0.5 would be written $0000 8000, 0.25 would be $0000 4000, and so on.
Negatives are handled just like integers. This means that -1.0 would be written $FFFF 0000, whereas -0.5 would be $FFFF 8000, -0.25 would be $FFFF C000, and so on.
Angles
Angles in this game appear to always be words, where 0 degrees is $0000, 90 degrees is $4000, 180 degrees is $8000, and so on.
External Links
References