Camera constructor

const Camera({ required int id, required int width, required int height, required Vector3 position, required Matrix3 rotation, required double fx, required double fy, double znear = 0.2, double zfar = 200.0, double ndcYSign = -1.0, })

Creates a camera with explicit intrinsics and extrinsics.

• width/height are in pixels and must be > 0.
• fx/fy are focal lengths in pixels and must be > 0.
• rotation is camera → world (columns are right, up, forward).
• znear/zfar define clip planes (OpenGL-style), znear > 0, zfar > znear.

Implementation

const Camera({
  required this.id,
  required this.width,
  required this.height,
  required this.position,
  required this.rotation,
  required this.fx,
  required this.fy,
  this.znear = 0.2,
  this.zfar = 200.0,
  this.ndcYSign = -1.0, // default for Flutter texture targets
})  : assert(width > 0, 'Camera width must be greater than 0, got: $width'),
      assert(
        height > 0,
        'Camera height must be greater than 0, got: $height',
      ),
      assert(fx > 0, 'Focal length fx must be greater than 0, got: $fx'),
      assert(fy > 0, 'Focal length fy must be greater than 0, got: $fy'),
      assert(
        znear > 0,
        'Near clip plane must be greater than 0, got: $znear',
      ),
      assert(
        zfar > znear,
        'Far clip plane ($zfar) must be '
        'greater than near clip plane ($znear)',
      );