Welcome, Guest. Please login or register. Did you miss your activation email?

Author Topic: Render Texture with a View  (Read 164 times)

0 Members and 1 Guest are viewing this topic.

bszandras

  • Newbie
  • *
  • Posts: 6
    • View Profile
    • Email
Render Texture with a View
« on: July 30, 2020, 03:51:12 pm »
I can not really figure this out on my own so please help me guys.
In my little "game" i draw stuff to my render window, and if I move the view, it just works like it is supposed to.
But if i draw things to a RenderTexture (clear, draw, display), then load the texture into the sprite then draw the sprite on the window, the RenderTexture stays in place like every other object.
Is there a way I can make the RenderTexture to allways cover my view?

thanks in advance

Stauricus

  • Full Member
  • ***
  • Posts: 191
    • View Profile
    • Email
Re: Render Texture with a View
« Reply #1 on: July 30, 2020, 06:09:13 pm »
it's hard to tell without any code, but my guess is that you are drawing this sprite to the same coordinates in the window view everytime.

bszandras

  • Newbie
  • *
  • Posts: 6
    • View Profile
    • Email
Re: Render Texture with a View
« Reply #2 on: July 30, 2020, 06:23:11 pm »
Yes I am drawing it to the same position everytime, however that is not the problem.

My goal is to "cut" through a black RenderTexture with shapes, for lighting, and currently it works great on the first frame. But when i move my view the RenderTexture does not seem to "move" with it, because it still shows the "cut" on the first fram, even tough i clear redraw and display every frame. So I think my Problem is that the render texture is assigned to the RenderWindow and not my current view. (I set the View)

Stauricus

  • Full Member
  • ***
  • Posts: 191
    • View Profile
    • Email
Re: Render Texture with a View
« Reply #3 on: July 30, 2020, 10:37:18 pm »
can't you post some image of the problem and code? its hard to guess whats happening.

bszandras

  • Newbie
  • *
  • Posts: 6
    • View Profile
    • Email
Re: Render Texture with a View
« Reply #4 on: July 31, 2020, 09:19:15 am »
I did not post code originally cause I am working with Box2D as a physics engine, and even the code that isn't part of that is pretty much a whole spaghetti
What I m doing is first constructing a convex shape, and on its points i am drawing Quads.
First i draw on the screen a completely brown RenderTexture (that works perfectly fine) then i draw the convex shape onto another RenderTexture, and then everything with the Quads i draw on the RenderWindow.
It is supposed to look like a cave.
My problem is, as it is on the image (i hope i attached it perfectly), that after i move the RenderTextures stay in place. Moving the sprites with the view works for the brown background, but not for the darker background of the cave (image 2 and 3).

What I think my problem is:
The RenderTexture does not move with the view and so the relative position of the convex shape is allways the same

I may missunderstand how RT-s work, but what I think my goal is and how it is supposed to work, that it fills the view, and moves with it.

I hope I could explain it, english is not my first language, sorry if I am not really clear.

 

anything