Dota 2 Workshop Tools/Scripting/API/Global.TraceLine

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Function Description

bool TraceLine(table parameters)

Does a raytrace along a line specified by two vectors, returning the first entity or geometry hit along the way. Script version of UTIL_TraceLine().

Example

-- Traces a line 100 units forward from the postion of the player
-- If the trace hits, a line is drawn to the hit position.
local playerEnt = Entities:FindByClassname(nil, "player")
local startVector = playerEnt:GetCenter()
local traceTable =
{
	startpos = startVector;
	endpos = startVector + RotatePosition(Vector(0,0,0), playerEnt:GetAngles(), Vector(100, 0, 0));
	ignore = playerEnt;
	mask =  33636363 -- TRACE_MASK_PLAYER_SOLID from L4D2 script API, may not be correct for Source 2.
}

TraceLine(traceTable)

if traceTable.hit 
then
	DebugDrawLine(traceTable.startpos, traceTable.pos, 0, 255, 0, false, 1)
	DebugDrawLine(traceTable.pos, traceTable.pos + traceTable.normal * 10, 0, 0, 255, false, 1)
else
	DebugDrawLine(traceTable.startpos, traceTable.endpos, 255, 0, 0, false, 1)
end

Parameters

Type	Name	Description
table	parameters	Table used for both input and output.

Returns

bool - Whether the trace is successful. This only indicates that the trace was done, not whether it hit anything.

Input Parameters

Passed to the parameters table to set up the trace.

Type	Name	Description
Vector	startpos	Global vector where to start the trace.
Vector	endpos	Global vector where to end the trace.
int	mask	Collision type bitmask.
CBaseEntity	ignore	Entity to ignore when tracing.

Output parameters

Output written by the function to the parameters table.

Note: These parameters may not exist if the trace does not hit. Check for nil before using.

Type	Name	Description
Vector	pos	Global vector where the trace hit.
float	fraction	Fraction from the start to end where the trace hit.
bool	hit	Whether the trace hit something. Always present.
CBaseEntity	enthit	Handle of the entity the trace hit.
bool	startsolid	Whether the trace started inside something. Note: This parameter is set to nil if it is false
Vector	normal	World space normal vector of the surface hit.