Hide/Show mesh with parent

[gordonramp]

Hi,

I'm hoping someone can help me with this..

Basically, I want to be able to show and hide an object in front of the camera. It's actually showing the object fine with the keyhit but I'm unable to hide it again. The object is parented to the camera and so moves around nicely in full view. How can I hide, delete or shift the object from view. This code resides in the Main Loop of my program. Thanks.

 

if KeyHit(KEY_F5)==1 then
if showthing==0 then
local object=0.6
local vwep = LoadMesh("abstract::object1.gmf")
LoadMesh("abstract::object1",vwep)
vwep:SetParent(fw.main.camera,0)
vwep:SetPosition(Vec3(-0.0*object,-0.01*object,0.45*object),0)      
showthing=1
else
showthing=0
end
end

[macklebee]

I wouldn't load the mesh in the main loop but in the initial setup. Why are you loading the mesh twice?

 

Is it "vwep" that you are trying to hide/show? if so just do:

vwep:Hide() and vwep:Show() toggled by if the variable showthing is equal to 0 or 1.

[gordonramp]

Ahh, well I adapted this bit of code from the FPS gun script that comes with the SDK. I agree, I don't want to load the object twice but it seems to be the only way I can get it to show. I'll play around with your suggestions. I'm actually trying to show and hide object1.

[gordonramp]

This is a little more tidy...loading the object once.

But I haven't got the vwep:Hide() and vwep:Show() working..

 

if KeyHit(KEY_F5)==1 then
if showthing==0 then
local object=0.6
local vwep = LoadMesh("abstract::object1.gmf")
vwep:SetParent(fw.main.camera,0)
vwep:SetPosition(Vec3(-0.0*object,-0.01*object,0.45*object),0)      
showthing=1
else
showthing=0
end
end

[gordonramp]

This gives an error on the second toggle saying 'attempt to index global value 'vwep' a nill value'. It comes from the vwep:Hide() line. The object is appearing but still not disappearing. Can anyone see why?

 

if KeyHit(KEY_F5)==1 then
if showthing==0 then
local object=0.6
local vwep = LoadMesh("abstract::object1.gmf")
vwep:SetParent(fw.main.camera,0)
vwep:SetPosition(Vec3(-0.0*object,-0.01*object,0.45*object),0)
vwep:Show()      
showthing=1
else
vwep:Hide()
showthing=0
end
end

[ZioRed]

You should declare the variable before the Main loop else it is not visible in the "else" code:

 

local vwep = LoadMesh("abstract::object1.gmf")

# ...begin main loop

if KeyHit(KEY_F5)==1 then
if showthing==0 then
	local object=0.6
	vwep:SetParent(fw.main.camera,0)
	vwep:SetPosition(Vec3(-0.0*object,-0.01*object,0.45*object),0)
	vwep:Show()      
	showthing=1
else
	vwep:Hide()
	showthing=0
end
end

# ...end main loop

[gordonramp]

Hi ZioRed,

Thanks and when I do that the error of course disappears but not the object so I must have something amiss in the variable. I tried the below as well but the object does not toggle on and off.

Perhaps it is not possible to hide an object when it is parented.

 

local vwep = LoadMesh("abstract::object1.gmf")
--inloop--------------------------------------
if KeyHit(KEY_F5)==1 then
if showthing==0 then
local object=0.6
vwep:SetParent(fw.main.camera,0)
vwep:SetPosition(Vec3(-0.0*object,-0.01*object,0.45*object),0)
showthing=1
vwep:Show()
else
showthing=0
vwep:Hide()
end
end

[ZioRed]

It works with parenting too, the following test works:

 

require("Scripts/constants/keycodes") 

--Register abstract path 
RegisterAbstractPath("") 

--Set graphics mode 
if Graphics(1024,768)==0 then 
Notify("Failed to set graphics mode.",1) 
return 
end 

world=CreateWorld() 
if world==nil then 
Notify("Failed to initialize engine.",1)   return 
end 

gbuffer=CreateBuffer(GraphicsWidth(),GraphicsHeight(),1+2+4+8) 

camera=CreateCamera() 
camera:SetPosition(Vec3(0,0,-2)) 

mesh_parent = CreateCube()
mesh_parent:SetColor(Vec4(0,0,1,1))
mesh_parent:Move(Vec3(0.5,0,0))

mesh=CreateCube() 
mesh:SetParent(mesh_parent)
mesh:Move(Vec3(-1,0,0))

light=CreateDirectionalLight() 
light:SetRotation(Vec3(45,45,45)) 

while AppTerminate()==0 do 

if KeyHit(KEY_ESCAPE)==1 then
	break
end 

if KeyHit(KEY_F5) == 1 then
	if EntityHidden(mesh) == 1 then
		mesh:Show()
	else
		mesh:Hide()
	end
end

UpdateAppTime() 
world:Update(AppSpeed()) 

SetBuffer(gbuffer) 
world:Render() 
SetBuffer(BackBuffer()) 
world:RenderLights(gbuffer) 

Flip(0)

end

[gordonramp]

ZioRed,

Nice that works and I'm sure I can adapt it to my specific needs. Thankyou.

[ZioRed]

No problem, we're here to help each others