util.IntersectRayWithSphere
number, number util.IntersectRayWithSphere( Vector rayOrigin, Vector rayDelta, Vector shperePosition, number sphereRadius )
Description
Performs a ray-sphere intersection and returns the intersection positions or nil.
Arguments
2 Vector rayDelta
The end position of the ray relative to the start position. Equivalent of
direction * distance.Returns
Example
-- Store entity we look at
local ent = NULL
-- Do this every frame
hook.Add( "Think", "Think_IntersectRayWithOBBExample", function()
-- Store player object
local ply = LocalPlayer()
-- If player looked at some valid entity, swtich our entity to that
local trEnt = ply:GetEyeTrace().Entity
if ( IsValid( trEnt ) ) then ent = trEnt end
-- No entity? do nothing
if ( !IsValid( ent ) ) then return end
local start = ply:GetShootPos()
local delta = ply:GetAimVector() * 500
local endpos = start + delta
-- Perform a ray intersection against a sphere from the player's eyes
local frac1, frac2 = util.IntersectRayWithSphere( start, delta, ent:GetPos() + ent:OBBCenter(), ent:OBBMaxs():Length() )
--print( "res: ", frac1, frac2 ) -- For debugging
-- Display intersection points
if ( frac1 ) then
local intersect1 = LerpVector( frac1, start, endpos )
local intersect2 = LerpVector( frac2, start, endpos )
debugoverlay.Axis( intersect1, angle_zero, 10, 0.01 )
debugoverlay.Axis( intersect2, angle_zero, 10, 0.01 )
end
-- Draw the OBB visualization, requires developer 1 in console.
debugoverlay.Sphere( ent:GetPos() + ent:OBBCenter(), ent:OBBMaxs():Length(), 0.01, frac1 != nil and Color( 0, 255, 0 ) or Color( 255, 0, 0 ) )
end )
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