env_quadraticbeam
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 Class hierarchy
|
|---|
| CEnvQuadraticBeam |
| effects.cpp
|
| Class hierarchy
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| client side |
| C_QuadraticBeam |
| c_effects.cpp
|
env_quadraticbeam is an entity available in all 
Source games. It is a duplicate of the beam entity, but with ability to arc by using a quadratic equation. It can be used to produce a similar effect to the 
physics gun. The formula used to form the curve can be found here.
Important:Other than origin and color, this entity has no keyvalues or inputs! Values listed under 'Fields' can only be accessed with an external plugin, or the NetProp manager found in certain VScript-supported titles (
and 
).Fields
m_targetPosition <FIELD_POSITION_VECTOR>
- END point
m_controlPosition <FIELD_POSITION_VECTOR>
- CONTROL point (see picture)
m_scrollRate <FIELD_FLOAT>
- Must be value between -4, 4
m_flWidth <FIELD_FLOAT>
Keyvalues
- Origin (origin) <vector>
- Start point of the beam
Inputs
- Color <color255>
- Changes color
Spawning via vscript example
function SpawnQuadBeam(start, end, control, color="255 0 0", model="sprites/laserbeam.spr") {
// precache the beam sprite
PrecacheModel(model)
// spawn the beam and set the start point
local ent = SpawnEntityFromTable("env_quadraticbeam", { origin = start })
// set the end point for the beam
NetProps.SetPropVector(ent, "m_targetPosition", end)
// set the control point for the curve
NetProps.SetPropVector(ent, "m_controlPosition", control)
NetProps.SetPropFloat(ent, "m_scrollRate", 2)
NetProps.SetPropFloat(ent, "m_flWidth", 5)
// set the beam color
DoEntFire("!self", "color", color, 0, null, ent)
// set the beam sprite
ent.SetModel(model)
}
//Draw a beam from the players origin point to the nearest prop_dynamic in a 2048hu radius
local start_pos = GetListenServerHost().GetOrigin()
local end_pos = Entities.FindByClassnameNearest("prop_dynamic", eye_pos, 2048)
//spawn our beam with a control value of 4
SpawnQuadBeam(start_pos, end_pos, 4)