Raycast: Difference between revisions
→Examples: Fixed spelling mistake
Nikitaivanov (talk | contribs) (Created page with "File:Raycast1.png 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.) Inputs: * From: the start of the line. * To: the end of the line. Outputs: * Hit?: Returns whether the line hits an object. * Hit Pos: The point where the object is detected, or [0, 0, 0] if it...") |
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{{Block | |||
|image=Raycast.png | |||
|type=s | |||
|folder=Objects | |||
|input1={{Port|v|From}} | |||
|input2={{Port|v|To}} | |||
|output1={{Port|t|Hit?}} | |||
|output2={{Port|v|Hit Pos}} | |||
|output3={{Port|o|Hit Obj}} | |||
}} | |||
Traces a line between two points and outputs | Traces a line between two points and outputs the following correspondingly: | ||
* [[Truth (True & False)|True]] if it hits an object. | |||
* The point where the object is detected, or <code>0, 0, 0</code> otherwise. | |||
* The object that was hit, or <code>None</code> if none is detected or the ground is hit. | |||
== Notes == | |||
* A Raycast can only detect 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. | |||
* | * Raycast won't detect an object that has been [[Create Object|created]] in the same frame. You have to wait 1 frame after creating an object for Raycast to detect it. | ||
* It cannot detect [[ | * It cannot detect blocks with no [[Collider|collision]]. | ||
== Raycast drawing == | === 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 | 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 script blocks and no normal blocks. | |||
Because red lines require that the raycast hits the floor or a block with collision, if intersection with a floor is not an option, you must use a loophole to get regular blocks to appear in play mode. If a normal block is | Because red lines require that the raycast hits the floor or a block with collision, if intersection with a floor is not an option, you must use a loophole to get regular blocks to appear in play mode. | ||
If a normal block is ''inside'' a script 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 script block makes it start not visible). | |||
Then set it in the path of a Raycast line to turn it red. | |||
== Examples == | |||
Cast a ray in the direction an object is facing. | |||
The <code>{{Port|v|0,0,1}}</code> indicates the object points in the positive Z axis by default, and the raycast length is 1. | |||
{{Image|Raycast example1.png}} | |||
[[Category:Blocks]] | [[Category:Blocks]] | ||
