Exhibit #4: Clearing the Screen

What We Did

• Let's get back to WebGL, which we hope to use throughout the semester.
• We clear the screen (i.e. our canvas) with the command gl.clear(gl.COLOR_BUFFER_BIT).
• Here, we tell WebGL to clear the color buffer.
• The command also accepts other arguments, but we talk about them later in the course.
• Use gl.clearColor(r, g, b, a) to set the color use to clear the screen.
• The last argument is the alpha channel, which will have an effect when we deal with blending. For now, it doesn't have any effect on the screen we see.
• All arguments range from 0 (darkest) to 1 (brightest).