Smooth interpolation from a bunch of transformation matrices

[vijaykiran]

Hello,

I was wondering what is the easiest way in Vizard 3.0 to do a smooth view interpolation if I have a bunch of 4x4 transformation matrices stored in a text file.

On a similar token, is there any sample code/example that comes with vizard that illustrates quaternion usage?

Thanks,
Vijay.

[farshizzo]

You can use the vizmat.Interpolate function to linearly interpolate between the position values of the matrix:

pos = vizmat.Interpolate(pos1,pos2,0.5)

You can also use the vizmat.slerp function to perform spherical linear interpolation between quaternion values of the matrix:

quat = vizmat.slerp(quat1,quat2,0.5)

Viewpoint objects have a setQuat method that allows you to specify the rotation as a quaternion. Is this the usage you are looking for?

[vijaykiran]

farshizzo,

Thanks for the reply. I was sort of looking for this, but I would need to extract the position and quat info before using them.

Given a 4 x 4 transformation matrix, are there any routines that directly extracts the 'pos' and 'quat'?

Thanks,
Vijay.

[farshizzo]

If you have a list of 16 values representing the 4x4 matrix, then you can initialize a viz.Matrix object with it:

matrix_data = [1,2,3,...,16] # 4x4 matrix values

m = viz.Matrix(matrix_data) #Create matrix object
print m.getPosition() #Print position
print m.getQuat() #Print quaternion