rotate object around point - GameCreators Forum

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Blobblie

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Posted: 5th Dec 2006 10:05

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hi, i'm new to the forum.

how can i rotate an object around a point rather than an axis? i.e the front upper left corner of a cube.

thank you

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BatVink

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Posted: 5th Dec 2006 10:47 Edited at: 5th Dec 2006 10:48

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Welcome to the forums. There's a search button at the bottom of each board, you'll find loads of posts on this topic, here's just a few below.

One thing to point out, rotation is always around an axis. It may just be that your axis is offset, but a "point" doesn't give enough information on how the rotation should take place.

http://forum.thegamecreators.com/?m=forum_view&t=80289&b=7

http://forum.thegamecreators.com/?m=forum_view&t=49499&b=7

http://forum.thegamecreators.com/?m=forum_view&t=63114&b=7

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Zotoaster

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Posted: 5th Dec 2006 21:00

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I think you can just offset limb 0 before you rotate it, using the offset limb command. If you want it to still look centered you can just position the object the negative value of the offset.

I personally am a math freak, so I would do it the hard, complicated way, just for self satisfaction

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Blobblie

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Posted: 6th Dec 2006 03:35

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thanks a lot zotoaster, that worked fine!

maybe you can help me out with some mathematical problem too, since you said you liked math. how can i deduce what the corner coordinates are, of my 0 limb offsetted, repositioned and rotated cubes? because my aim is to make more cubes, 0 limb offsetted to those coordinates.

and does anyone know why my cpu gets so strained by this code?

thank you

+ Code Snippet

autocam off
position camera 0,200,-1000

MAKE OBJECT CUBE 1,100
wait 100
scale object 1,800,6,800
wait 100

MAKE OBJECT CUBE 2,100
wait 100
scale object 2,800,6,800
wait 100

OFFSET LIMB 2,0,-50,0,50
position object 2,400,0,-400
yrotate object 2,144

wait 100

MAKE OBJECT CUBE 3,100
wait 100
scale object 3,800,6,800
wait 100

OFFSET LIMB 3,0,-50,0,-50
position object 3,-400,0,-400
yrotate object 3,36
wait 100
position camera 0,200,-2000

wait key

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BatVink

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Posted: 6th Dec 2006 16:46

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All DB Pro projects use as much CPU as they can get, unless you use SYNC SLEEP(). But that is at the expense of a slower application, you wouldn't use it mid-game

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Zotoaster

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Posted: 6th Dec 2006 23:04

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If you're just asking where the corners are, then you can just get the coordinates of each vertex. There's not one vertex per corner, there's actually 4 for a cube. But you only need the coordinate of 1 vertex from each corner.

Type in get vertexdata position x(), and click on the command, and press F1. That should give you some insight into the vertex commands.

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Xenocythe

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Posted: 6th Dec 2006 23:28

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Actually, from experience of making a 3D modeller, there are 3 vertexes at each corner of a cube. One vertex from each corresponding face.

-Mansoor Siddiquie

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indi

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Location: Earth, Brisbane, Australia

Posted: 7th Dec 2006 04:42 Edited at: 7th Dec 2006 04:43

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wouldnt it be 6? 2 polys per face for each face combine into 3 sides. hence 6
I guess packages can lose vertices and bind a few polys together until you told the application to break polys into individual groups.

ahh i see where your coming from perhaps some corners do not have a diagonal line between the polys on that corner.

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Blobblie

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Posted: 7th Dec 2006 08:31

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thank you all. i understand now, that i have to read more tutorials.

autocam off
point camera 0,12,150
position camera 0,12,150
xrotate camera 25
move camera -1080

MAKE OBJECT CUBE 1,100
wait 100
scale object 1,800,25,800
wait 100
color object 1,1
wait 100

MAKE OBJECT CUBE 2,100
wait 100
scale object 2,800,24,800
wait 100

OFFSET LIMB 2,0,-50,0,50
position object 2,400,0,-400
yrotate object 2,18

wait 100

MAKE OBJECT CUBE 3,100
wait 100
scale object 3,800,24,800
wait 100

OFFSET LIMB 3,0,-50,0,-50
position object 3,-400,0,-400
yrotate object 3,162

MAKE OBJECT CUBE 4,100
wait 100
scale object 4,800,24,800
wait 100

OFFSET LIMB 4,0,-50,0,-50
position object 4,0,0,830
yrotate object 4,306

MAKE OBJECT CUBE 5,100
wait 100
scale object 5,800,24,800
wait 100

OFFSET LIMB 5,0,-50,0,-50
position object 5,0,0,830
yrotate object 5,-36

SYNC ON
SYNC RATE 0

noQuarter=1

do
IF LEFTKEY()=1 THEN move camera 1080; camAngle#=camAngle#+72; yrotate camera camAngle#; move camera -1080; wait 200
IF RIGHTKEY()=1 THEN move camera 1080; camAngle#=camAngle#-72; yrotate camera camAngle#; move camera -1080; wait 200

IF DOWNKEY()=1
IF noQuarter=1; move camera 1080; xrotate camera 80; move camera -1080; noQuarter=0; wait 200
endif
 endif

IF DOWNKEY()=1
IF noQuarter=0; move camera 1080; xrotate camera 25; move camera -1080; noQuarter=1; wait 200
endif
 endif

SYNC
loop

+ Code Snippet

autocam off
point camera 0,12,150
position camera 0,12,150
xrotate camera 25
move camera -1080

MAKE OBJECT CUBE 1,100
wait 100
scale object 1,800,25,800
wait 100
color object 1,1
wait 100

MAKE OBJECT CUBE 2,100
wait 100
scale object 2,800,24,800
wait 100

OFFSET LIMB 2,0,-50,0,50
position object 2,400,0,-400
yrotate object 2,18

wait 100

MAKE OBJECT CUBE 3,100
wait 100
scale object 3,800,24,800
wait 100

OFFSET LIMB 3,0,-50,0,-50
position object 3,-400,0,-400
yrotate object 3,162

MAKE OBJECT CUBE 4,100
wait 100
scale object 4,800,24,800
wait 100

OFFSET LIMB 4,0,-50,0,-50
position object 4,0,0,830
yrotate object 4,306

MAKE OBJECT CUBE 5,100
wait 100
scale object 5,800,24,800
wait 100

OFFSET LIMB 5,0,-50,0,-50
position object 5,0,0,830
yrotate object 5,-36

SYNC ON
SYNC RATE 0

noQuarter=1

do
IF LEFTKEY()=1 THEN move camera 1080; camAngle#=camAngle#+72; yrotate camera camAngle#; move camera -1080; wait 200
IF RIGHTKEY()=1 THEN move camera 1080; camAngle#=camAngle#-72; yrotate camera camAngle#; move camera -1080; wait 200

 IF DOWNKEY()=1
IF noQuarter=1; move camera 1080; xrotate camera 80; move camera -1080; noQuarter=0; wait 200
endif
 endif

 IF DOWNKEY()=1
IF noQuarter=0; move camera 1080; xrotate camera 25; move camera -1080; noQuarter=1; wait 200
endif
 endif

SYNC
loop

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