I want to join heart into plane. Both meshes are 2D (0 value in Y axis). I know that i could join one by one edges with alt+M but i have heck of A LOT EDGES, it would take ages to finish. How can i merge those two objects to be connected with edges. Thanks for all effort to help me.
First apply transformations to your objects (Ctrl+A-->Loc, Rot&Scale). Select your heart mesh, then the plane in Object Mode, then enter the Edit Mode of the plane, press Spacebar and type Knife Project. Extrude the plane a bit and give it a Remesh Modifier being in Object Mode. Apply the modifier, then delete extruded vertices. Finally join meshes with Ctrl+J. Correct some vertices position (merge them with Alt+M).