Traces a line between two points and outputs True if the line hits anything, the position of intersection, and the object it hit. (Think of it as a laser, you stand in the starting position and shoot a laser to the end position.)

Note that Raycast detects when the line hits the outside surface of a block. If the line starts inside the block then it will not hit that block when going out. Also, it won't detect an object that has been created in the same frame, you have to wait 1 frame after creating the object for Raycast to detect it.

It cannot detect Pass Throughs and Script Blocks.

Raycast

Raycast drawing

In edit mode, a visible line will be drawn between the start and end points: green if there is not a hit, red otherwise. This effect can be used to make red and green line drawings, but it won't be visible in play mode unless the level contains only scripting blocks and no normal blocks.

Because red lines require the presence of a non-scripting block, you must use a loophole to get them to appear in play mode. If a normal block is inside a scripting block at the start of the level, it will not trigger the hiding of script blocks and Raycast lines. On the first frame the normal block can then be moved to the floor, and set to visible (being inside a scripting block makes it start not visible). Then set it in the path of a Raycast line to turn it red.