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lua/pac3/core/client/parts/clip.lua

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+--[[
+| This file was obtained through the combined efforts
+| of Madbluntz & Plymouth Antiquarian Society.
+|
+| Credits: lifestorm, Gregory Wayne Rossel JR.,
+| 	Maloy, DrPepper10 @ RIP, Atle!
+|
+| Visit for more: https://plymouth.thetwilightzone.ru/
+--]]
+
+local render_EnableClipping = render.EnableClipping
+local render_PushCustomClipPlane = render.PushCustomClipPlane
+local LocalToWorld = LocalToWorld
+local IsEntity = IsEntity
+
+local BUILDER, PART = pac.PartTemplate("base_drawable")
+
+PART.FriendlyName = "clip"
+PART.ClassName = "clip2"
+PART.Groups = {'model', 'modifiers'}
+PART.Icon = 'icon16/cut.png'
+
+function PART:OnParent(part)
+	if not part.AddModifier then return end
+	part:AddModifier(self)
+
+
+	-- this is only really for halos..
+	local ent = self:GetOwner()
+
+	if ent:IsValid() then
+		function ent.pacDrawModel(ent)
+			self:PreOnDraw()
+			ent:DrawModel()
+			self:PostOnDraw()
+		end
+	end
+end
+
+function PART:OnUnParent(part)
+	if not part:IsValid() then return end
+	if not part.RemoveModifier then return end
+
+	part:RemoveModifier(self)
+end
+
+do
+	local bclip
+
+	function PART:PreOnDraw()
+		bclip = render_EnableClipping(true)
+
+		local pos, ang = LocalToWorld(self.Position + self.PositionOffset, self:CalcAngles(self.Angles + self.AngleOffset), self:GetBonePosition())
+		local normal = ang:Forward()
+
+		render_PushCustomClipPlane(normal, normal:Dot(pos))
+	end
+
+	local render_PopCustomClipPlane = render.PopCustomClipPlane
+
+	function PART:PostOnDraw()
+		render_PopCustomClipPlane()
+
+		render_EnableClipping(bclip)
+	end
+end
+
+BUILDER:Register()