What is the best way for add a grapnel. The physics is really basic, something like:
I've started by create a line between the player & the platform, change the origin of the player where the grapnel hit the platform and just rotate but it's not very ... logic.
Have you checked out this tutorial and .capx... https://www.scirra.com/tutorials/1032/g ... creen-play
it may help get you started. I have also seen some rope tutorials in the tutorial section that might help too.
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Also take a look my hook-shot example: