Function calcCameraParams

stackgl_modules/index.js:19194–19249

(scene, isOrtho)

}

function calcCameraParams(scene, isOrtho) {
  var bounds = scene.bounds
  var cameraParams = scene.cameraParams
  var projection = cameraParams.projection
  var model = cameraParams.model

  var width = scene.gl.drawingBufferWidth
  var height = scene.gl.drawingBufferHeight
  var zNear = scene.zNear
  var zFar = scene.zFar
  var fovy = scene.fovy

  var r = width / height

  if(isOrtho) {
    ortho(projection,
      -r,
      r,
      -1,
      1,
      zNear,
      zFar
    )
    cameraParams._ortho = true
  } else {
    perspective(projection,
      fovy,
      r,
      zNear,
      zFar
    )
    cameraParams._ortho = false
  }

  //Compute model matrix
  for(var i=0; i<16; ++i) {
    model[i] = 0
  }
  model[15] = 1

  var maxS = 0
  for(var i=0; i<3; ++i) {
    maxS = Math.max(maxS, bounds[1][i] - bounds[0][i])
  }

  for(var i=0; i<3; ++i) {
    if(scene.autoScale) {
      model[5*i] = scene.aspect[i] / (bounds[1][i] - bounds[0][i])
    } else {
      model[5*i] = 1 / maxS
    }
    if(scene.autoCenter) {
      model[12+i] = -model[5*i] * 0.5 * (bounds[0][i] + bounds[1][i])
    }
  }
}