use previous frame as background

[kokoilie]

i'm trying to make a rotating effect
the camera isn't projecting on the whole window and the next frame is rotated a bit, roughly like this
;......-\--------------
;........\
;.........\
(-) previous frame
(\) current frame
(...) just needed a way to position the symbols correctly
i've managed to make a close effect by omitting the IrrBeginScene in the loop but what i end up with is when the model was closer to the camera then i can hide behind it's "ghost" projections

i was wondering if there is a command to use an image (like the previous frame) the be used as background color in the IrrBeginScene function

[hendu]

GL doesn't guarantee that not clearing will leave the existing image there. So you need to capture the image somehow, and then render it again at the start of the next frame.

[kokoilie]

that's exactly the point but i hoped i'll find more help about it here

i might try exploring what can i do tho it's always easier to be taught by someone who already did it

[rcalvin]

Hey,

I don't really understand what you are trying to describe, but it sounds to me like you need to render to a texture, slap that texture on a quad, and then render the quad before anything else on the next cycle of the loop. I believe their is an official tutorial that deals with RTTs.

[hendu]

Grab a screenquad from the code snippets forum. Using it will let you render the image; for RTT use see the RTT example as mentioned.