I’m using OpenGL and drawing polygons in a 2D view. How could I blur a polygon, without using glsl, and only things like stencil buffer and stuff. Thanks
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I’m using OpenGL and drawing polygons in a 2D view. How could I blur a polygon, without using glsl, and only things like stencil buffer and stuff. Thanks
The normal method uses the accumulation buffer instead of the stencil buffer. You basically re-draw your polygon(s) a number of times, but change the viewing perspective slightly each time. Exactly what you change determines the style of blur you get. For example, if you want an effect like zooming a camera lens, you can change the view frustum slightly between frames. If you want motion blur, you change the camera view angle instead. With some extra work, you can do some slightly odd-looking effects, such as moving your viewpoint forward, and zooming back at the same time, so (most of) the scene remains roughly the same size, but the perspective you’re viewing it from constantly changes.