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  #1  
Old 09-11-2012, 08:53 AM
nabrahamson nabrahamson is offline
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Join Date: Sep 2011
Posts: 36
I'm not sure if it's clear on what I'm trying to do. The first attached picture contains two coordinate axis drawn on the screw. The first one replicates the coordinate system that is created in inspector with axis colored red, green and blue. The second coordinate system shares its origin with the first, but is drawn to represent the global x,y,z coordinate system.

The basis for the first coordinate system is from the matrix created from the command:

Code:
<node3d>.getMatrix(viz.ABS_GLOBAL, node='Inst-1430')
[ 0.000000, -0.004384, -0.008988, 0.000000,
  -0.000000, 0.008988, -0.004384, 0.000000,
  0.010000, 0.000000, 0.000000, 0.000000,
  -0.381762, -0.560596, -2.557960, 1.000000 ]
So the x-coordinate is drawn by creating a vector using the 4th and 1st row of this matrix and scaled (just so they are visible). And the y (elements 5-7 of the matrix) and z (elements 9-11 of the matrix) coordinates are created using a similar method.

Code:
[-0.381762 + 0.0,  -0.560596 + (-0.004384), -2.557960 + (-0.008988)]
So the point I used to create the y coordinate is called y_trans.
I made the assumption that using the command

Code:
moveaction = vizact.moveTo(y_trans, mode = viz.ABS_GLOBAL)
<node3d>.addAction(moveaction)
Would move the screw to the endpoint of the green axis. Instead, that command moves the screw to the position shown in the second attachment. Is this because the transformation matrix given by the getMatrix command is applied to the node before the translation of the moveTo command?

Here is the complete code I am using to draw those axis:

Code:
def draw_line(p, axis, color):
	viz.startLayer(viz.LINES)
	viz.lineWidth(3)
	viz.vertexColor(color)
	viz.vertex(p)
	viz.vertex(axis)
	viz.endLayer()
	
def debug_script():
	#Data is a helper class that creates a global object to share all of our object data between scripts
        part = Data.getData().parts_list[0]
       	global screw
	screw = part.getChildren()[0]
	point = [-0.381762, -0.560596, -2.557960]
	x_axis = [ 0.000000, -0.004384, -0.008988]
	y_axis = [  -0.000000, 0.008988, -0.004384]
	z_axis = [ -0.01, -0.00, 0.00]
	
	x_global = [1.0, 0.0, 0.0]
	y_global = [0.0, 1.0, 0.0]
	z_global = [0.0, 0.0, 1.0]
	
	global x_trans
	x_trans = [point[i] + x_axis[i]*30 for i in range(3)]
	global y_trans
	y_trans = [point[i] + y_axis[i]*30 for i in range(3)]
	global z_trans
	z_trans = [point[i] + z_axis[i]*30 for i in range(3)]
	
	draw_line(point, x_trans, [1,0,0])
	draw_line(point, y_trans, [0,1,0])
	draw_line(point, z_trans, [0,0,1])
	
	x_global_axis = [point[i] + x_global[i] for i in range(3)]
	y_global_axis = [point[i] + y_global[i] for i in range(3)]
	z_global_axis = [point[i] + z_global[i] for i in range(3)]
	
	draw_line(point, x_global_axis, [1,1,0])
	draw_line(point, y_global_axis, [1,0,1])
	draw_line(point, z_global_axis, [0,1,1])
Attached Thumbnails
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Name:	local_global_axis.png
Views:	3381
Size:	297.6 KB
ID:	524   Click image for larger version

Name:	rel_global.png
Views:	3333
Size:	202.0 KB
ID:	525  
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  #2  
Old 09-11-2012, 09:11 AM
farshizzo farshizzo is offline
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Join Date: Mar 2003
Posts: 2,849
There is not enough information for me to say what the problem is. My guess is you are applying the transformation at the wrong hierarchy in the scene. node.getChildren will not return anything unless you previously called node.getChild or parented a node to the object. So it's not clear to me exactly which node you are operating on.

Click on the screw you want to translate in Inspector, then post a screenshot of the node path bar at the top, showing the full hierarchy of the screw. This should provide me with enough information to post some sample code for you.
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  #3  
Old 09-11-2012, 11:38 AM
nabrahamson nabrahamson is offline
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Join Date: Sep 2011
Posts: 36
Here is the screen cap you requested.
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ID:	526  
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  #4  
Old 09-11-2012, 11:49 AM
farshizzo farshizzo is offline
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Posts: 2,849
Thanks. The following code should translate the screw object along its local Y-axis:
Code:
screw = model.insertGroupBelow('Inst-1430')
screw.setPosition([0,0.1,0])
This works by inserting a node below the Inst-1430 node. If you had called getChild on the node, it would have inserted a transform above the node, which would then translate the node in the incorrect reference frame.

Make sure you only call insertGroupBelow once per sub-node, since each call will insert a new node.
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