Modify Program 4.4 so that the “view” matrix is constructed using the “look-at” function. Then experiment with setting the “look-at” parameters to various locations, such as looking at the sun (in which case the scene should appear normal), looking at the planet, or looking at the moon.

Program 4.4

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private Matrix4fStack mvStack = new Matrix4fStack(5); public void display(GLAutoDrawable drawable) { // setup of background, depth buffer, rendering program, and proj matrices unchanged tf = elapsed Time/1000.0; // time factor, as before //push view matrix onto the stack mvStack.pushMatrix(); mvStack.translate(-cameraX, // -cameraY, -cameraZ); pyramid== sun mvStack.pushMatrix(); mvStack translate (0.0f, 0.0f, 0.0f); // sun's position // sun's rotation on its axis mvStack.pushMatrix(); mvStack.rotate((float)tf, 1.0f, 0.0f, 0.0f); gl.glUniformMatrix4fv(mvLoc, 1, false, mvStack.get(vals)); gl.glBindBuffer(GL_ARRAY_BUFFER, vbo[1]); gl.glVertexAttribPointer (0, 3, GL_FLOAT, false, 0, 0); gl.glEnable VertexAttribArray(0); gl.glEnable(GL_DEPTH_TEST);