OpenGL is a great framework for hardware-accelerated rendering. Before losing any more word about it, let's consider a more basic rendering setup to draw a 3D sphere to a floating window, as shown in the following screenshot:
So what we have here are as follows:
A
jit.windowobject that provides us with rendering destination or rendering context. Its name is referenced by the other OpenGL objects.A
jit.gl.renderobject that controls and drives our rendering. We need to send a bang to it to draw the next frame. But before that, we send it the message erase, so the last frame is overwritten with the background color. Anerase_colormessage with 4 numbers sets up a new background color. If this color has an alpha value smaller than 1, the last frame will still be partly visible, causing feedback-like effects. Play around with it to get a better understanding of the erase message and the process of drawing a frame!A
jit.gl.gridshapeobject that contains the data for a spherical...