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trace_forward | engine | AMX X Documentation

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trace_forward

Syntax
									native trace_forward(const Float:start[3], const Float:angle[3], Float:give, ignoreEnt, &Float:hitX, &Float:hitY, &Float:shortestDistance, &Float:shortestDistLow, &Float:shortestDistHigh);
								
Variable Description
start
Starting origin
angle
Trace line direction
give
Units that a trace line can be longer than the
shortest trace line to still be considered hitting
the same obstacle
ignoreEnt
Entity index that traces will ignore, -1 if traces
should not ignore any entities
hitX
Variable to store X axis value of shortest trace
line endpoint in
hitY
Variable to store Y axis value of shortest trace
line endpoint in
shortestDistance
Variable to store length of shortest trace line in
shortestDistLow
Variable to store Z axis offset of shortest trace
line in
shortestDistHigh
Variable to store Z axis offset of highest trace
line that satisfies "give" condition in

Description
Attempts to describe an obstacle by firing trace lines in a specified direction, offset on the z-axis around an origin.

Note
The functionality of this native can mostly be replaced by a single
hull trace. This native does not write to the global engine module
trace handle.

Note
This native is intended to examine an obstacle in front of a standing
player. Start should usually be the origin of a client while angle
should be its forward angle vector. 73 traces are fired, each offset by
one unit on the z-axis from the last, starting at -36 and moving up to
+36. This is because a standing player model is 72 units high, so 73
units of clearance are required to fit them. The values stored in the
various parameters then attempt to describe the obstacle.

Note
To fully understand the nuances of the algorithm it is necessary to
view its source code located in engine.cpp of the engine module.

Return
This function has no return value.
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