아이튜브(itubes.co.kr)'s 반짝 정보 : 2. polygon...

2. polygon

Category : Open GL/study

Date : 2010/03/30 14:33

GL_POINTS

GL_LINE_STRIP

GL_LINE_LOOP

GL_LINES

GL_TRIANGLES

GL_TRIANGLE_STRIP

Draws a series of triangles (three-sided polygons) using vertices v0, v1, v2, then v2, v1, v3 (note the order), then v2, v3, v4, and so on. The ordering is to ensure that the triangles are all drawn with the same orientation so that the strip can correctly form part of a surface.

GL_TRIANGLE_FAN

Same as GL_TRIANGLE_STRIP, except that the vertices are drawn v0, v1, v2, then v0, v2, v3, then v0, v3, v4, and so on.

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// Translates 4 units into the screen.
gl.glTranslatef(0, 0, -4); // OpenGL docs

If you run the application now the screen is still black. Why? Because OpenGL ES render from where the current position is, that by default is at point: 0, 0, 0 the same position that the view port is located. And OpenGL ES don’t render the things that are too close to the view port. The solution to this is to move the draw position a few steps into the screen before rendering the square:

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Run the application again and you will see that the square is drawn but quickly moves further and further into the screen. OpenGL ES doesn’t reset the drawing point between the frames that you will have to do yourself:

// Replace the current matrix with the identity matrix
gl.glLoadIdentity(); // OpenGL docs

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