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Question regarding 3D object rotation #39

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h3xstream opened this issue Jun 15, 2023 · 0 comments

h3xstream commented Jun 15, 2023 •

edited

It is possible to do multiple transformations in an object "block" (begin - end).

GRRLIB_ObjectViewBegin();
GRRLIB_ObjectViewRotate(0,0,a*4);
GRRLIB_ObjectViewTrans(0,1.0,0);
GRRLIB_ObjectViewRotate(0,0,a*2);
GRRLIB_ObjectViewTrans(0,0.5,0);
GRRLIB_ObjectViewRotate(0,0,a*2);
GRRLIB_ObjectViewEnd();

GRRLIB_DrawCube(0.4f,0.5,0x0000FFFF);

It seems that rotation is always relative to 0,0,0 position.

How can I make my object rotate relatively to a 0,1,0 ?
I need to rotate object like a planet orbit around the sun, not on itself.

//The following code won't work
GRRLIB_ObjectViewBegin();
GRRLIB_ObjectViewTrans(0,1.0,0);
GRRLIB_ObjectViewTrans(0,0.5,0);
GRRLIB_ObjectViewRotate(0,0,a*2);
GRRLIB_ObjectViewEnd();

GRRLIB_DrawCube(0.4f,0.5,0x0000FFFF);

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