How to interpolate two different geometric shapes

[BobSynfig]

Yes and no, this topic has already been discussed
https://forums.synfig.org/search?q=morphing

Making circle to other shape

draw a circle with 8 vertex instead of 4 (use the spline points settings of the circle tool parameters panel) draw two horizontal guidelines that represent the top and bottom of the second shape split the tangents of the (4 extra) spline points that are crossed by the guidelines got to animation mode go to frame 24 and change the shape of the circle using the guidelines press play… Not complicated at not more work at all. I think it takes longer to start up Inkscape and draw a circle there and…