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Attention | Topic was automatically imported from the old Question2Answer platform. |
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Asked By | raould |
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Old Version | Published before Godot 3 was released. |
following on from
https://forum.godotengine.org/8486/what-is-a-transform-really
and
https://forum.godotengine.org/7469/matrix-vs-tranform-local-vs-global?show=7469#q7469
I scale first then do rotate, then do translate. Why does it only end up in the right place when my scaling vector is (1,1,1)?
extends Node
const Util = preload( "util.gd" )
const k_mother_sx = 20
const k_mother_sy = 5
const k_mother_sz = 10
var k_mother_s3 = Vector3( k_mother_sx, k_mother_sy, k_mother_sz )
func moveto( theta, radius, z ):
var transform = Util.get_origin_transform()
transform = transform.scaled( k_mother_s3 )
transform = transform.rotated( Vector3(0,0,1), theta )
transform = transform.translated( Vector3(0, 0, z) )
transform = transform.translated( Vector3(0, radius, 0) )
transform = transform.rotated( Vector3(1,0,0), PI/2 )
set_transform( transform )
util.gd:
const k_origin_transform = Transform( Vector3(1,0,0), \
Vector3(0,1,0), \
Vector3(0,0,1), \
Vector3(0,0,0) )
static func get_origin_transform():
return k_origin_transform
Depends on what you call “the right place”. When you use scaled and rotated, modifications are done relative to (0,0,0) (notice there is no “origin” expected in their arguments).
A simpler example and a definition of “expected state” versus “obtained state” could be easier to understand.
Note: it’s not documented, but if you want an identity transform you can simply write var transfom = Transform(), no need for a helper 
Zylann | 2016-10-09 02:41