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Draw without clean the buffer

Started by Guardanapitcho Aug 21, 2011 at 2:32 PM 1 replies 1.2k views

Original Post

Aug 21, 2011 at 2:32 PM

Hello. I wrote an application that simulates a double pendulum, and I want to draw it's path on the screen. The problem is: If I don't clean the buffer, the pendulum will "multiply", appearing all over the screen.
So, basically, I need to clean the pendulum but not the path.
I thought of storing all the points of the path and draw it at every clean, but I guess it's not a nice way to do it.
So, I thought of drawing the pendulum in a "layer" and the path in another one. But there is a way to do it? If not, what do you suggest me to do?

Thanks

cleaning*

Aqua Costa

Aug 21, 2011 at 3:02 PM

To do what you want you have to clear the render target and draw everything you want again... Thats how "every" game is done

Digitalfragment

Aug 22, 2011 at 3:44 AM

So, I thought of drawing the pendulum in a "layer" and the path in another one. But there is a way to do it? If not, what do you suggest me to do?

You could create a rendertarget which receives the draw call for the path every frame without being cleared, then begin rendering to the backbuffer with a normal clear, but then restore the content of the rendertarget so it fills the background, then draw the entire pendulum.

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