2D View: ofCamera clipping left, right, top, and bottom

beginners
#1

Hi…,

I want to draw directly into my viewport, without an ofFBO, and I need some clipping.

I want only to draw in a rectangle (e.g. ofRectangle ( 100, 100, 500, 200), my objects should be clipped with this rectangle.

Can I clip left, right, top, and bottom with an ofCamera and how?

Thanks

Mike

#2 
camera.begin(ofRectangle ( 100, 100, 500, 200));

should work

1 Like
#3

Hi Arturo,

yes, I’ve tried this one in the void ofApp::draw() method, but with no effect:

ofCamera camera;
camera.begin( ofRectangle ( 100, 100, 500, 200) );
camera.end();

ofRect(0,0,300,800);

Any ideas?

Thanks

Mike

#4

you have to draw things between begin/end, also when using a camera the default behaviour is 0,0 at the center of the viewport and y growing upwards so don’t expect the same code you might be using with the default perspective to work the same

#5

Hi arturo,

I get nuts, my following code shows still nothing:

ofCamera camera;
camera.begin( ofRectangle ( 0, 0, 600, 600) );
ofRect(0,0,300,800);
camera.end();

Is there an working 2D example?

Thanks

Mike

#6

Hi…,

I have found this

void ofViewport(ofRectangle viewport)

function, which does exactly what I need, without an ofCamera.

Thanks

Mike

#7

Sorry again,

now I have found for me the best 2D border clipping function:

glScissor( x, y, width, height);
glEnable(GL_SCISSOR_TEST);

Thanks

Mike