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trace
This is a script event on id Tech 4 engines, present on DOOM 3, Quake 4 and Prey. Below you can find its signature for each game that declares it.
DOOM 3
Returns the fraction of movement completed before the box from 'mins' to 'maxs' hits solid geometry when moving from 'start' to 'end'. The 'passEntity' is considered non-solid during the move.
| Property |
Value |
| Type |
script event |
| Returns |
float |
| Parameters |
vector start, vector end, vector mins, vector maxs, float contents_mask, entity passEntity |
| Section |
system events (called via 'sys.') |
Quake 4
| Property |
Value |
| Type |
script event |
| Returns |
float |
| Parameters |
vector, vector, vector, vector, float, entity |
Prey
| Property |
Value |
| Type |
script event |
| Returns |
float |
| Parameters |
vector, vector, vector, vector, float, entity |

Last changed Sep 21, 2026
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