GUI context problems

[Ywa]

Hi folks,

 

I'm trying to draw some text on top of my 3D world. I have my rendering code after my world update & render, but it still only shows my 2D stuff with a black background. I've read about PostRender hooks, but it only seems to be available to entities. How can I fix this to work with my normal game logic? Because adding a chat via an entity doesn't seem to make much sense to me.

 

Thanks in advance.

[Roland]

Why not just a pivot for that as a holder for your GUI code.

[Ywa]

Well I did that to test if it made any difference, but it doesn't. Still a red box with a black background. Removing the 3 lines of code renders my 3D world just fine.

 

This is my pivot code. Pivot is created after creating a world and before loading a map.

function Script:PostRender(Context)
--local Context = App.Context
Context:Clear()
Context:SetColor(1,0,0)
Context:DrawRect(20,20,100,100)
end

[macklebee]

you are clearing the context which will remove the world render from it...

[Ywa]

That fixed it. Thanks!

 

Wish the documentation was more clear on this matter. All examples include the clearing.

Do I need to clear the context on every new frame/render? (before rendering the world)

[macklebee]

No - world rendering does not need that. The examples where they were clearing the context was just a simple way to clear the screen to prevent smearing of variable or moving 2D items like text or rectangles but those same examples do not have a world being rendered. When the world is rendered it will overwrite every pixel in its context/buffer - effectively "clearing" the last render or 2D item drawn.

[Roland]

This will draw a red rectangle when attached to a pivot.

 

function Script:PostRender(context)

  context:SetBlendMode(Blend.Alpha)

  context:SetColor(1,0,0,1)
  context:DrawRect( 100, 100, 200, 200)

  context:SetBlendMode(Blend.Solid)

end

 

You should not call Clear.. that's done in the App:Loop already