message: handle cell angles close to zero in dcd reader
diff: @@ -11,6 +11,7 @@ import { Vec3 } from '../../mol-math/linear-algebra';
  import { degToRad, halfPI } from '../../mol-math/misc';
  import { Cell } from '../../mol-math/geometry/spacegroup/cell';
  import { Mutable } from '../../mol-util/type-helpers';
  +import { EPSILON, equalEps } from '../../mol-math/linear-algebra/3d/common';
  const charmmTimeUnitFactor = 20.45482949774598;
  @@ -66,7 +67,12 @@ export function coordinatesFromDcd(dcdFile: DcdFile): Task<Coordinates> {
  } else {
  frame.cell = Cell.create(
  Vec3.create(c[0], c[2], c[5]),
  - Vec3.create(degToRad(c[1]), degToRad(c[3]), degToRad(c[4]))
  + // interpret angles very close to 0 as 90 deg
  + Vec3.create(
  + degToRad(equalEps(c[1], 0, EPSILON) ? 90 : c[1]),
  + degToRad(equalEps(c[3], 0, EPSILON) ? 90 : c[3]),
  + degToRad(equalEps(c[4], 0, EPSILON) ? 90 : c[4])
  + )
  );
  }
  }
  