lider',   key: 'fieldOfView', min:  1, max: 179, change: render, },
  ]);

  const fieldOfViewRadians = degToRad(60);

  // Uniforms for each object.
  const planeUniforms = {
    u_colorMult: [0.5, 0.5, 1, 1],  // lightblue
    u_texture: checkerboardTexture,
    u_world: m4.translation(0, 0, 0),
  };
  const sphereUniforms = {
    u_colorMult: [1, 0.5, 0.5, 1],  // pink
    u_texture: checkerboardTexture,
    u_world: m4.translation(2, 3, 4),
  };

  function drawScene(projectionMatrix, cameraMatrix) {
  