gweiss Posted September 7, 2017 Share Posted September 7, 2017 learning python I'm trying to write a script that will place a bone between two locators. I managed to read the locators position and place the bone in the first locator's position I got the distance between the two locators using hou.distanceTO() and passed it to the bone's length channel. the only thing I'm missing and can't find the way to do it is find the angles for the rotation of the bone to aim at the second locator. how can I do that? this is my code: import objecttoolutils #store selected objects sl = hou.selectedNodes() sla = sl[0] slb = sl[1] #evaluate position of selected objects n1 = sla.worldTransform().extractTranslates() n2 = slb.worldTransform().extractTranslates() #create bone and position to first selected object my_bone = hou.node("/obj").createNode('bone') px = my_bone.parm("tx").set(n1[0]) py = my_bone.parm("ty").set(n1[1]) pz = my_bone.parm("tz").set(n1[2]) pt1 = hou.Vector3(n1) pt2 = hou.Vector3(n2) b1 = pt1.distanceTo(pt2) bl = my_bone.parm('length') bl.set(b1) Thanks gweiss Quote Link to comment Share on other sites More sharing options...
bandini Posted September 7, 2017 Share Posted September 7, 2017 There's a lookat matrix that can help you out there. buildLookatRotation(to_node, up_vector=None) → hou.Matrix4 Return a matrix that will rotate this object to look at the specified object. The returned hou.Matrix4 object transforms this object from its current position in world space so that its negative z axis points at the origin of the to_node object. up_vector can either be a hou.Vector3 object or None. If it is None, this method uses an up vector of hou.Vector3(0, 1, 0). You can extract the rotation values from the return value with hou.Matrix4.extractRotates(). You can set an object’s transform with hou.ObjNode.setWorldTransform(). # Set the cam1 object's transform so it points at geo1. cam1 = hou.node("/obj/cam1") lookat_obj = hou.node("/obj/geo1") cam1.setWorldTransform(cam1.buildLookatRotation(lookat_obj)) See also hou.ObjNode.setWorldTransform(). Quote Link to comment Share on other sites More sharing options...
gweiss Posted September 9, 2017 Author Share Posted September 9, 2017 Thank you so much! that is exactly what I was looking for G Quote Link to comment Share on other sites More sharing options...
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