Y angle bugged? - GameCreators Forum

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Zero G Scott

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Location: California, USA, Earth, Sol Sys

Posted: 11th Jun 2014 00:30 Edited at: 11th Jun 2014 00:30

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While using the curveAngle command I noticed a peculiar wobble at certain angles and after some investigating I'm getting some incorrect angle returns from the Object Angle Y:

0 --to--> 90 --to--> 0/360 --to--> 270 --to--> 360/0

Just to be clear it starts going up to 90 then goes back down to 0 then switches to 360 and goes down to 270 then back up to 360.

When I use EZrotates EZro_GetEulerY() command I get this reading:

0 --to--> 90 --to--> 0/-0 --to--> -90 --to--> 0

That's a full 360 rotation going to the objects right. Is anyone else having this problem or is it something localized to my machine? Anyone find a solution if its not just me?

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Seditious

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Posted: 11th Jun 2014 00:44

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http://en.wikipedia.org/wiki/Gimbal_lock

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Green Gandalf

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Playing: Malevolence:Sword of Ahkranox, Skyrim, Civ6.

Posted: 11th Jun 2014 01:29

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Do humans experience Gimbal lock and if not why not?

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pcRaider

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Posted: 11th Jun 2014 16:28 Edited at: 11th Jun 2014 17:35

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You can use Limb-command.

` atanfull
` spooky
` use EZ rotate
sync on : sync rate 30 : autocam off

make matrix 1,1000,1000,32,32

make object cone 1,10
rotate object 1,90,0,0
fix object pivot 1
position object 1,500,40,500
set object cull 1,0

make object cube 2,5
` hide object 2

position camera 500,100,400
pitch camera down 30
s#=1

do
   m=0
   ex#=object angle x(1) : ey#=object angle y(1) : ez#=object angle z(1)
   EZro_Set ex#, ey#, ez#
   if rightkey() then EZro_LY s#
   if leftkey() then EZro_LY -s#
   if upkey() then EZro_LX s#
   if downkey() then EZro_LX -s#
   ex#=EZro_GetX()
   ey#=EZro_GetY()
   ez#=EZro_GetZ()
   rotate object 1,ex#,ey#,ez#
   rotate object 2,ex#,ey#,ez#
   position object 2,object position x(1),object position y(1),object position z(1)
   move object 2,10
   ang#=getY(1,2)
   text 0,0,"Y :"+str$(ang#)
   sync
loop

function getY(o1,o2)
   ang#=atanfull(object position x(o2)-object position x(o1),object position z(o2)-object position z(o1))
   if ang# < 0 then ang#=ang#+360
endfunction ang#

+ Code Snippet

` atanfull
` spooky
` use EZ rotate
sync on : sync rate 30 : autocam off

make matrix 1,1000,1000,32,32

make object cone 1,10
rotate object 1,90,0,0
fix object pivot 1
position object 1,500,40,500
set object cull 1,0

make object cube 2,5
` hide object 2

position camera 500,100,400
pitch camera down 30
s#=1

do
   m=0
   ex#=object angle x(1) : ey#=object angle y(1) : ez#=object angle z(1)
   EZro_Set ex#, ey#, ez#
   if rightkey() then EZro_LY s#
   if leftkey() then EZro_LY -s#
   if upkey() then EZro_LX s#
   if downkey() then EZro_LX -s#
   ex#=EZro_GetX()
   ey#=EZro_GetY()
   ez#=EZro_GetZ()
   rotate object 1,ex#,ey#,ez#
   rotate object 2,ex#,ey#,ez#
   position object 2,object position x(1),object position y(1),object position z(1)
   move object 2,10
   ang#=getY(1,2)
   text 0,0,"Y :"+str$(ang#)
   sync
loop

function getY(o1,o2)
   ang#=atanfull(object position x(o2)-object position x(o1),object position z(o2)-object position z(o1))
   if ang# < 0 then ang#=ang#+360
endfunction ang#

windowsXp

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Van B

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Joined: 8th Oct 2002

Location: Sunnyvale

Posted: 11th Jun 2014 18:36

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I tend to avoid 'getting' the angle, instead I'd just store it in a global or whatever is appropriate, so the object can be rotated without needing to read its angle back. Typically I'd make a type with sets of position and angle variables.

Just a thought, it's a decent option until you introduce physics

I am the one who knocks...

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