LUA screenshot script results in white terrain

[DaveLee]

Hey folks,

 

I'm trying to render a screenshot via a LUA script that I saved from last year, but my terrain ends up white like this:

 

 

Can anyone tell what I'm doing wrong? Here's the script:

 

local width=1920
local height=1200

require("scripts/constants/engine_const")

local buffer=CreateBuffer(width,height,BUFFER_COLOR)
if buffer==nil then
Notify("Failed to create buffer!",1)
return
end

local buffer2=CreateBuffer(width,height,BUFFER_COLOR)
if buffer2==nil then
Notify("Failed to create buffer!",1)
buffer=nil
return
end

SetBuffer(buffer)

fw:Render()

SetBuffer(buffer2)
DrawImage(GetColorBuffer(buffer),0,0,buffer:Width(),buffer:Height())

SetBuffer(BackBuffer())

SaveBuffer(buffer2,"test.png")
buffer=nil
buffer2=nil

[Mumbles]

I don't know, but doesn't your first buffer need BUFFER_DEPTH as well as BUFFER_COLOR?

[Josh]

Does the scene appear fine, otherwise? ATI hasn't fixed their driver bug they created recently that makes terrain not appear

 

He doesn't need a depth buffer for that, since the depth is processed by the time the results are copied to that buffer.

[Guest Red Ocktober]

your converted (to BlitzMAX) code seems to work prefectly here...

 

Function TakePicture()

Local width=1024 
Local height=768 


Local buffer:TBuffer=CreateBuffer(width,height,BUFFER_COLOR) 
If buffer=Null Then 
       Notify("Failed to create buffer!",1) 
       Return 
EndIf 

Local buffer2:TBuffer=CreateBuffer(width,height,BUFFER_COLOR) 
If buffer2=Null Then 
       Notify("Failed to create buffer!",1) 
       buffer=Null 
       Return 
EndIf 

SetBuffer(buffer) 

Game.fw.Render() 

SetBuffer(buffer2) 
DrawImage(GetColorBuffer(buffer),0,0,buffer.Width(),buffer.Height()) 

SetBuffer(BackBuffer()) 

SaveBuffer(buffer2,"test.png") 
buffer=Null 
buffer2=Null 

EndFunction

 

 

gonna try it in the lua editor next...

 

 

here's the code i used in the lua script editor... just used start.kua and replaced the mainloop with your stuff...

 

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)) 

light=CreateSpotLight(10) 
light:SetRotation(Vec3(45,55,0)) 
light:SetPosition(Vec3(5,5,-5)) 

--Uncomment these two lines to produce a crash:
--light:Free()
--light:SetPosition(Vec3(5,5,-5)) 

material=LoadMaterial("abstract::cobblestones.mat") 

mesh=CreateCube() 
mesh:Paint(material) 

ground=CreateCube() 
ground:SetScale(Vec3(10.0,1.0,10.0)) 
ground:SetPosition(Vec3(0.0,-2.0,0.0)) 
ground:Paint(material) 

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

local width=1920  
local height=1200  

require("scripts/constants/engine_const")  

local buffer=CreateBuffer(width,height,BUFFER_COLOR)  
if buffer==nil then  
       Notify("Failed to create buffer!",1)  
       return  
end  

local buffer2=CreateBuffer(width,height,BUFFER_COLOR)  
if buffer2==nil then  
       Notify("Failed to create buffer!",1)  
       buffer=nil  
       return  
end  

SetBuffer(buffer)  

world:Render()  

SetBuffer(buffer2)  
DrawImage(GetColorBuffer(buffer),0,0,buffer:Width(),buffer:Height())  

SetBuffer(BackBuffer())  

SaveBuffer(buffer2,"test2.png")  
buffer=nil  
buffer2=nil

 

the cobblestone texture on the cubes was washed out almost white like your terrain...

 

using a geforce9500 gpu...

 

the two pics are attached below... top one from BlitzMAX

 

--Mike

[macklebee]

I think it has something to do with the PNG format... I am getting weird results with it. If I look at the resulting png screenshot in MSPaint, it looks fine. If I look at it with Windows Photo Gallery, the terrain and sky are white. If I open it with Gimp (where the entire scene is covered by a transparency checkerboard) and save it to another format (JPG), the terrain and sky are whited out.

 

If I use TGA for the file format to save the buffer to, it appears to work ok.

[Guest Red Ocktober]

confirmed...

 

Mack's conclusion about the problem having something to do with the .png format seems to be correct... output to .jpg is also problematic... but tga and bmp seem to work ok...

 

--Mike

[DaveLee]

TGA works great. Thanks guys!

 

[macklebee]

Well there is definitely an issue there but i am not sure what to make of it. If I just save a framework rendered buffer to PNG there is no issue... it looks correct.

[Richard Simpson]

That's a cool script...