Trajectory Preview

[chendeni]

I have a request for a new feature.
All of the following objects can launch the player on a fixed trajectory using a velocity vector: Pipes, sling stars without paths, Piantas, WaterPressure, ? coins that launch the player, Rock Mario boost panels, the ends of Sproutle Vines, PlantSlider, and Banandelions(Creeper). With the current version of Whitehole, it is extremely tedious to figure out where Mario will land when the object arguments require a velocity vector instead of a path.

This feature will make a trajectory preview render when a compatible object is selected. The trajectory preview will assume downwards planar gravity, and calculate the velocity vector from the object's arguments and/or rotation. Then it will calculate a parabolic trajectory based on the vector and downwards acceleration due to gravity and render it in the 3D view.