#1
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Saving as a WRL
Hi,
Is there any tool to save the scene created by Vizard script as a WRL file? If there is no such a tool, then could you recommend the solution for the following problem. I know the parameters of the cylinder in Vizard: position of the bottom, position of the top, scale. How to convert them to WRML cylinder node parameters ‘translation’, rotation’ and ‘scale’? Thank you, Andrey |
#2
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WRL files are simple text files, so you can manually generate the file. Here is an example WRL file that creates a cylinder:
Code:
Transform { translation 0 0.25 0 rotation 0 1 0 0 scale 1 1 1 children [ Shape { geometry Cylinder { radius 0.05 height 0.5 } } ] } |
#3
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Sure, no problem to generate wrl. The problem is that the translation and rotation in WRML differ from Vizard. As to translation, WRML has opposite Z direction. More difficult situation is for rotation: since I have top (p1) and bottom (p2) cylinder positions in Vizard, to get WRML rotation parameters I tried
vizmat.LookToQuat(vizmat.VectorToPoint(p1,p2)) and vizmat.QuatToAxisAngle(vizmat.LookToQuat(vizmat.Ve ctorToPoint(p1,p2))) but both variants produces something mysterious. Could you help? |
#4
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The VRML rotation field is an axis-angle rotation. To convert a Vizard axis-angle rotation to a VRML axix-angle rotation, you will need to negate the x,y components of the axis vector and convert the degrees to radians. Here is a function that will return the VRML rotation of a cone given the bottom and top points of the cone:
Code:
def getVRMLConeRotation(bottom,top): v = viz.Vector(top) v -= bottom m = viz.Matrix() m.makeVecRotVec([0,1,0],v) r = m.getAxisAngle() return -r[0],-r[1],r[2],viz.radians(r[3]) |
#5
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Thank you, now the result is not misterious. But when I add saved WRL back to Vizard I get the cylinder mirrored from X axis in respect to the original one. Is it because of the reverse convertion while adding?
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#6
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I tested it out here and it seems to work fine. Can you provide a sample script that recreates your problem?
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#7
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Thank you again, I already found the bug, it works normal.
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