If you have a knob called mix which contains the amount of one of the cameras 
the expression should be this: 
Camera4.world_matrix*mix+Camera5.world_matrix*(1-mix)
With this you should be able to mix between the two cmaera paths.

Best regards,
Michael

On September 20, 2016 10:21:04 PM CEST, Bruno-Pierre Jobin <bpjo...@gmail.com> 
wrote:
>How would you guys mix animations from Camera 4 and Camera 5 into
>Camera 6? Putting Camera4.world_matrix+Camera5.world_matrix into
>local_matrix knob won’t work and I can understand why. But I’m having
>trouble figuring out what's the right expression.
>
>Thank you
>
>
>
>set cut_paste_input [stack 0]
>version 10.0 v3
>Camera2 {
>inputs 0
>translate {{curve x1021 50 x1041 150} {curve x1021 50 x1041 150} {curve
>x1021 50 x1041 150}}
>name Camera5
>selected true
>xpos -1715
>ypos 6719
>}
>Camera2 {
>inputs 0
>useMatrix true
>matrix {
>{{Camera4.world_matrix((Camera4.world_matrix-Camera4.world_matrix)+Camera5.world_matrix)}
>{Camera4.world_matrix((Camera4.world_matrix-Camera4.world_matrix)+Camera5.world_matrix)}
>{Camera4.world_matrix((Camera4.world_matrix-Camera4.world_matrix)+Camera5.world_matrix)}
>{Camera4.world_matrix((Camera4.world_matrix-Camera4.world_matrix)+Camera5.world_matrix)}}
>{{Camera4.world_matrix((Camera4.world_matrix-Camera4.world_matrix)+Camera5.world_matrix)}
>{Camera4.world_matrix((Camera4.world_matrix-Camera4.world_matrix)+Camera5.world_matrix)}
>{Camera4.world_matrix((Camera4.world_matrix-Camera4.world_matrix)+Camera5.world_matrix)}
>{Camera4.world_matrix((Camera4.world_matrix-Camera4.world_matrix)+Camera5.world_matrix)}}
>{{Camera4.world_matrix((Camera4.world_matrix-Camera4.world_matrix)+Camera5.world_matrix)}
>{Camera4.world_matrix((Camera4.world_matrix-Camera4.world_matrix)+Camera5.world_matrix)}
>{Camera4.world_matrix((Camera4.world_matrix-Camera4.world_matrix)+Camera5.world_matrix)}
>{Camera4.world_matrix((Camera4.world_matrix-Camera4.world_matrix)+Camera5.world_matrix)}}
>{{Camera4.world_matrix((Camera4.world_matrix-Camera4.world_matrix)+Camera5.world_matrix)}
>{Camera4.world_matrix((Camera4.world_matrix-Camera4.world_matrix)+Camera5.world_matrix)}
>{Camera4.world_matrix((Camera4.world_matrix-Camera4.world_matrix)+Camera5.world_matrix)}
>{Camera4.world_matrix((Camera4.world_matrix-Camera4.world_matrix)+Camera5.world_matrix)}}
>  }
>name Camera6
>selected true
>xpos -1763
>ypos 6819
>}
>push $cut_paste_input
>Camera2 {
>translate {{curve i x1001 0 x1021 50} {curve i x1001 0 x1021 50} {curve
>i x1001 0 x1021 50}}
>name Camera4
>selected true
>xpos -1811
>ypos 6716
>}
>Scene {
>inputs 3
>name Scene6
>selected true
>xpos -1942
>ypos 6803
>}_______________________________________________
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-- 
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