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[GreatLor]

First I must say that yesterday I came up with a quicker way to do the rotation (no use of square-roots - boy was that STUPID ?! :-) )

If anyone has any experience with vector-programming please give your opinions, here fallows; first the intit for the base-vectors:

ax#=50
ay#=0
az#=0

bx#=0
by#=-50
bz#=0

cx#=0
cy#=0
cz#=50

here is the main loop:

do
gosub rotate_ab
gosub rotate_bc
gosub rotate_ca
wait vbl
cls 0 ; Double-buffering is not important right now
loop

Here's the 'rotate_ab' subroutine:
; I use array 'siin#()' to store some sinus values (it's faster)

rotate_ab:

;two coordinate vectors for base vector a's new pos. (rotation)

a1x#=siin#(91)*ax#
a1y#=siin#(91)*ay#
a1z#=siin#(91)*az#
b1x#=siin#(1)*bx#
b1y#=siin#(1)*by#
b1z#=siin#(1)*bz#

;two coodinate vectors for base vector b's new pos.

b2x#=siin#(91)*bx#
b2y#=siin#(91)*by#
b2z#=siin#(91)*bz#
a2x#=siin#(1)*-ax#
a2y#=siin#(1)*-ay#
a2z#=siin#(1)*-az#

; now adding the two vectors of each base vector to them

; vector a

ax#=a1x#+b1x#
ay#=a1y#+b1y#
az#=a1z#+b1z#

; vector b

bx#=b2x#+a2x#
by#=b2y#+a2y#
bz#=b2z#+a2z#

return

; and two similar subroutines for the rotations around the two other axis (which I will not include here).

So is THIS the way others do vector rotations or are there faster (and more complicated) ways ?

Thanx in advance ! (hope somebody answers this :-D )