Render texture to prop

[Goz3rr]

I'm trying to make a portal entity, and i can't seem to figure out what's causing a few things.
When looking straight at the prop it works fine:

[t]http://puu.sh/39xEN.jpg[/t]

But when i pick up a prop (with physgun grab halo enabled, without it it doesnt happen), the render goes black:

[t]http://puu.sh/39xFv.jpg[/t]

And for some reason i can see the render through the prop its on, but not through different props:

[t]http://puu.sh/39xGh.jpg[/t]
[t]http://puu.sh/39xGJ.jpg[/t]

And also the crosshair goes invisible as soon as i spawn one. Here's the rendering code:

include("shared.lua")

ENT.RenderTarget = render.GetScreenEffectTexture()
local matView = CreateMaterial(
	"UnlitGeneric",
	"GMODScreenspace",
	{
		["$basetexture"] = ENT.RenderTarget,
		["$basetexturetransform"] = "center .5 .5 scale -1 -1 rotate 0 translate 0 0",
		["$texturealpha"] = "0",
		["$vertexalpha"] = "1",
	}
)

hook.Add("RenderScene", "WorldPortalRenderScene", function(origin, angles, fov)
	for _,ent in ipairs(ents.FindByClass("worldportal")) do
		ent:RenderScene(origin, angles, fov)
	end
end)

hook.Add("ShouldDrawLocalPlayer", "WorldPortalShouldDrawLocalPlayer", function(ply)
	if WorldPortalRender then
		return true
	end
end)

function ENT:Initialize()
	self:SetModelScale(1.2, 0)
end

function ENT:RenderScene(origin, angles, fov)
	local oldRT = render.GetRenderTarget()
	render.SetRenderTarget(self.RenderTarget)

	render.Clear(0, 0, 0, 255)
	render.ClearDepth()
	render.ClearStencil()

	WorldPortalRender = true
	render.RenderView({
		x = 0,
		y = 0,
		w = ScrW(),
		h = ScrH(),
		origin = self:GetPos() + Vector(0,0,500),
		angles = LocalPlayer():EyeAngles(),
		drawviewmodel = false,
		drawhud = false
	})
	WorldPortalRender = false
	render.UpdateScreenEffectTexture()

	render.SetRenderTarget(oldRT)
end

function ENT:Draw()
	self:DrawModel()

	if self.RenderTarget then
		matView:SetTexture("$basetexture", self.RenderTarget)
		render.SetMaterial(matView)
		mesh.Begin(MATERIAL_QUADS, 1)
			mesh.QuadEasy(self:GetPos() + Vector(-0.2, -23.2, 0), Vector(0, 1, 0), 40.5, -72)
		mesh.End()
	end
end

[Wizard of Ass]

You are better off getting your own render target rather than using the screen effect texture, be sure to also allocate a depth buffer.

[Goz3rr]

[QUOTE=Wizard of Ass;40922259]You are better off getting your own render target rather than using the screen effect texture, be sure to also allocate a depth buffer.[/QUOTE]

Great, i changed it to

ENT.RenderTarget = GetRenderTarget("WorldPortalRT", ScrW(), ScrH(), false)

And now the crosshair doesn't disappear anymore, and it works when holding props. You can still see it through the box though, can you elaborate on the depth buffer?

[Wizard of Ass]

GetRenderTargetEx is what you want to use.

[Goz3rr]

[QUOTE=Wizard of Ass;40923795]GetRenderTargetEx is what you want to use.[/QUOTE]

With which values for the flags exactly?

[Wizard of Ass]

Old code of mine which basically does render a view to a texture.

[lua]
local TEXTURE_FLAGS_CLAMP_S = 0x0004
local TEXTURE_FLAGS_CLAMP_T = 0x0008

local rt = GetRenderTargetEx("testRT",
512,
512,
RT_SIZE_NO_CHANGE,
MATERIAL_RT_DEPTH_SEPERATE,
TEXTURE_FLAGS_CLAMP_S | TEXTURE_FLAGS_CLAMP_T,
CREATERENDERTARGETFLAGS_UNFILTERABLE_OK
)

local drawMaterial = CreateMaterial("TestRT","UnlitGeneric",{
["$ignorez"] = 1,
["$vertexcolor"] = 1,
["$vertexalpha"] = 1,
["$nolod"] = 1,
["$basetexture"] = rt:GetName()
})

local view = {
angles = Angle(),
origin = Vector(),
x = 0,
y = 0,
w = 512,
h = 512,
drawhud = false,
drawviewmodel = false,
}

local inDraw = false
function ENT:Draw()
self:DrawModel()
if(inDraw) then
return
end
inDraw = true

local pos = self:GetPos()
local ang = self:GetAngles()

ang:RotateAroundAxis(ang:Forward(), 90)
ang:RotateAroundAxis(ang:Right(), 90)

local oldRT = render.GetRenderTarget()
render.SetRenderTarget(rt)
render.Clear(0, 0, 0, 255)
render.ClearDepth()
local w, h = ScrW(), ScrH()
render.SetViewPort(0, 0, 512, 512)
cam.Start2D()
render.RenderView(view)
surface.SetDrawColor((math.cos(math.rad(RealTime()*120))+1)*127.5)
surface.DrawRect(0, 0, 4, 4)
cam.End2D()
render.SetViewPort(0, 0, w, h)
render.SetRenderTarget(oldRT)

cam.Start3D2D(pos, ang, 1)
surface.SetMaterial(drawMaterial)
surface.SetDrawColor(255, 255, 255, 255)
surface.DrawTexturedRect(0, 0, 512, 512)
cam.End3D2D()

inDraw = false
end
[/lua]