small material fixes

unlit hack option for submaterial. because unlit materials from pac weren't being correctly used. works by forcing pac.Material lookup to replace the default fallback "Fix" material created by the submaterial.

reapply the hide flag on material part on initialize. because the fact that hiding the part should prevent auto-applying the material on its parent wasn't being obeyed at weartime

lua/pac3/core/client/parts/material.lua

@@ -271,6 +271,7 @@ for shader_name, groups in pairs(shader_params.shaders) do
 		self.rotation_angle = Angle(0, 0, 0)
 		timer.Simple(0, function()
 			self:SetbasetexturetransformAngle(self:GetbasetexturetransformAngle())
+			self:SetHide(self:GetHide())
 		end)
 	end
 

lua/pac3/core/client/parts/submaterial.lua

@@ -23,6 +23,7 @@ BUILDER:StartStorableVars()
 			return tbl
 		end,
 	})
+	BUILDER:GetSet("UnlitMaterialHack", false, {description = "hacky fix if the material comes from a material part with unlitgeneric shader.\nBut it will break raw url textures!"})
 	BUILDER:GetSet("RootOwner", false, { hide_in_editor = true })
 BUILDER:EndStorableVars()
 
@@ -63,6 +64,7 @@ function PART:UpdateSubMaterialId(id, material)
 	ent.pac_submaterials = ent.pac_submaterials or {}
 
 	local mat = self.Materialm
+	if self.UnlitMaterialHack then mat = pac.Material(self.Material, self) end
 
 	if not material then
 		if self.Material and self.Material ~= "" and mat and not mat:IsError() then
@@ -79,6 +81,11 @@ function PART:UpdateSubMaterialId(id, material)
 	end
 end
 
+function PART:SetUnlitMaterialHack(b)
+	self.UnlitMaterialHack = b
+	self:UpdateSubMaterialId()
+end
+
 function PART:PostApplyFixes()
 	self:UpdateSubMaterialId()
 end