Draw render target to matproxy?

[GreyGeist]

Hello guys! I'm wondering how I could draw a render target to the matproxy. The basic .vmt definition is as follows:

	"Proxies"
	{
		"Scope"
		{
			"textureScrollVar" 	"$baseTextureTransform"
			"fieldOfView"	"10"
			"scopeGeometry"	"24" // 1 / sin( arctan( radius / ( 2 * length ) ) )
		}
	}

The thing is, although I know how RT Scopes work using just a normal texture, I don't know how to write the proper code for rendering the view to the matproxy. Any lua you could give me would be great, as I don't really know where to start. This is what I have so far:

matproxy.Add( {
		name = "Scope", 
		init = function( self, mat, values )
			-- Store the name of the variable we want to set
			self.Mat_Scope_FOV = values.fieldOfView
			self.Mat_RT = GetRenderTarget("ins_mat_rt",1024,1024,false)
			mat:SetTexture("$basetexture",self.Mat_RT)
		end,
		bind = function( self, mat, ent )
			-- If the target ent has a function called GetPlayerColor ) then use that
			-- The function SHOULD return a Vector with the chosen player's colour.

			-- In sandbox this function is created as a network function, 
			-- in player_sandbox.lua in SetupDataTables
		   	local oldrt
			oldrt = render.GetRenderTarget( )
			render.SetRenderTarget( self.Mat_RT )
			render.SetViewPort( 0, 0, 1024, 1024 )
			render.Clear( 255, 000, 000, 255, true )
			local RTScopeCam = {}
			RTScopeCam.x = 0
			RTScopeCam.y = 0
			RTScopeCam.w = 1024
			RTScopeCam.h = 1024
			RTScopeCam.angles = LocalPlayer():EyeAngles()
			RTScopeCam.origin = LocalPlayer():GetShootPos()
			RTScopeCam.fov = self.Mat_Scope_FOV
			RTScopeCam.drawhud = false
			RTScopeCam.ortho = false
			RTScopeCam.drawviewmodel = false
			RTScopeCam.dopostprocess = false
			cam.Start2D()
				render.RenderView(RTScopeCam)
			cam.End2D()
			render.SetViewPort( 0, 0, ScrW( ), ScrH( ) )
			render.SetRenderTarget( oldrt )
	   end 
	} )

Which oddly crashes the game.

[Rubat]

You must call render.RenderView in RenderScene hook, without the cam2D nonsense.

[GreyGeist]

Thank you Robotboy! I was actually basing my code off some earlier code you posted a long time ago, so don't call it nonsense :P

Anyways, is there a way I can store the variable from Matproxy as a variable accessible by the rest of the SWEP I'm putting this in?

[Rubat]

I don't think I have ever posted any code with render.RenderView because I never was able to get it to work until recently.

You could access the SWEP via LocalPlayer():GetActiveWeapon() or LocalPlayer():GetWeapon("weapon_class") in dev branch/after next update.

[GreyGeist]

For some reason, the RT texture doesn't appear to be overriding properly. Instead, I get a white plane. This is my code:

SWEP.Mat_RT = nil
function SWEP:InitRTScope()
	--[[ OLD CODE
	if CLIENT then
		self.RenderTarget = GetRenderTarget( "insurrection_rt_scope", 1024, 1024, false )
		local mat
		mat = Material( "models/weapons/optics/lense_rt" )
		mat:SetTexture( "$basetexture", self.RenderTarget )
		--mat = Material( "models/m41a/pulse_rifle_ammo_zero" )
		--mat:SetMaterialTexture( "$basetexture", SWEP.RenderTarget )
		--mat = Material( "avp_pulserifle_ammo" )
		--mat:SetMaterialVector( "$tint", Vector( 1.2, 0, 0 ) )
		local color_red = Color( 189, 000, 000, 255 )
	end
	]]--
	self.Mat_RT = GetRenderTarget("ins_mat_rt",1024,1024,false)
	matproxy.Add( {
		name = "Scope", 
		init = function( self, mat, values )
			-- Store the name of the variable we want to set
			if values.fieldOfView then
				LocalPlayer():GetActiveWeapon().Scope_FOV = values.fieldOfView
			else
				LocalPlayer():GetActiveWeapon().Scope_FOV = 30
			end
			mat:SetTexture("$basetexture",LocalPlayer():GetActiveWeapon().Mat_RT)
		end,
		bind = function( self, mat, ent )
			-- If the target ent has a function called GetPlayerColor ) then use that
			-- The function SHOULD return a Vector with the chosen player's colour.

			-- In sandbox this function is created as a network function, 
			-- in player_sandbox.lua in SetupDataTables
	   end 
	} )
end // Called in Initialise in the SWEP code
hook.Add("RenderScene","InsurrectionRTScope", function( tmporigin, tmpviewangles, tmpfov)
	local tmprt = LocalPlayer():GetActiveWeapon().Mat_RT
	if IsValid(tmprt) then
				local oldrt = render.GetRenderTarget( )
				render.SetRenderTarget( tmprt )
				render.SetViewPort( 0, 0, 1024, 1024 )
				render.Clear( 255, 000, 000, 255, true )
				RTScopeCam = {}
				RTScopeCam.x = 0
				RTScopeCam.y = 0
				RTScopeCam.w = 1024
				RTScopeCam.h = 1024
				RTScopeCam.fov = LocalPlayer():GetActiveWeapon().Mat_Scope_FOV
				RTScopeCam.drawhud = false
				RTScopeCam.ortho = false
				RTScopeCam.drawviewmodel = false
				RTScopeCam.dopostprocess = false
				RTScopeCam.angles = tmpviewangles
				RTScopeCam.origin = tmporigin
				render.RenderView(RTScopeCam)
				render.SetViewPort( 0, 0, ScrW( ), ScrH( ) )
				render.SetRenderTarget( oldrt )
	end
end)

Edit: Nevermind, I'll move it to renderscene and see what happens. Missed that.

Edit: Didn't work. See updated code.

[Rubat]

Move matproxy.Init outside of any functions. Also, I believe you are supposed to update $basetexture every time you render to rendertarget.

[GreyGeist]

[QUOTE=Robotboy655;44829854]Move matproxy.Init outside of any functions. Also, I believe you are supposed to update $basetexture every time you render to rendertarget.[/QUOTE]

I can't actually find a definition for matproy.Init. How exactly do I use it?

[Rubat]

I meant matproxy.Add, sorry. Move it outside of any functions.

[GreyGeist]

Alright, tested it by moving the matproxy.Add to an autorun function. Will report back with results in an edit post.
Edit:
For some reason, the skybox is only being partially rendered . It's being filled with the red background in certain areas when I look upwards with my gun. Any idea what could be causing this? Otherwise, perfect. My draw hook:

hook.Add("RenderScene","InsurrectionRTScope", function( tmporigin, tmpviewangles, tmpfov)
	local tmprt = Insurgency_Mat_RT
	if tmprt then
				local oldrt = render.GetRenderTarget( )
				render.SetRenderTarget( tmprt )
				render.SetViewPort( 0, 0, 1024, 1024 )
				render.Clear( 255, 000, 000, 255, true )
				local RTScopeCam = {}
				RTScopeCam.x = 0
				RTScopeCam.y = 0
				RTScopeCam.w = 1024
				RTScopeCam.h = 1024
				RTScopeCam.fov = LocalPlayer():GetActiveWeapon().Scope_FOV
				RTScopeCam.drawhud = false
				RTScopeCam.ortho = false
				RTScopeCam.drawviewmodel = false
				RTScopeCam.dopostprocess = false
				RTScopeCam.angles = tmpviewangles
				RTScopeCam.origin = tmporigin
				render.RenderView(RTScopeCam)
				render.SetViewPort( 0, 0, ScrW( ), ScrH( ) )
				render.SetRenderTarget( oldrt )
	end
end)

I'll bring this up in a different thread and mark this as solved.