There is the Alternativa3D 5.6.0 update on the site.

Changelog:

• Increased performance of scene building and rendering by moving the calculation of UV-coordinates at the rendering time
• Added mechanism of adjusting visibility between certain parts of the scene. Thus:
  • added new classes:
    alternativa.engine3d.core.Splitter
    alternativa.engine3d.core.Sector
  • added new properties:
    Scene3D.splitters
    Scene3D.sectors
    Camera3D.currentSector
• Added new material class alternativa.engine3d.materials.MovieClipMaterial
• Improved faces auto-welding algorithm
• In faces auto-welding algorithm added parameter which allows not to weld adjacent faces if in the resulting face any two adjacent edges appear to be on one line
• Added parsers of 3DS and OBJ formats
• Added loading progress events for classes Loader3DS and LoaderOBJ
• Fixed bug which occurred when a 3DS-model without faces was loaded
• Now the names of dummy objects in 3DS data are correctly parsed
• Loader3DS.units renamed to Loader3DS.scale
• Fixed bug in LoaderOBJ which occurred during loading of a model without UV-coordinates
• Added parameters Loader3DS.loadMaterials and LoaderOBJ.loadMaterials which allow not to load model textures
• Added class alternativa.utils.UnitsConverter to calculate conversion coefficient between measurement units
• Added method View.projectViewPointToPlane()
• The method View.get3DCoords() now respects camera zoom
• Fixed bug because of which changes in camera settings were not taken into account by the View.get3DCoords() method
• Fixed bug in Matrix3D.getRotations() which led to wrong results in certain situations
• Fixed bug appearing during activated viewport interactivity which is not placed on stage
• Improved algorithm of collision detection and now collider should not catch corners
• Fixed bug in methods Object3D.transformation and Object3D.globalToLocal(), which appeared if the object was not on stage
• Fixed bug in method Object3D.globalToLocal(), appearing during method call at stage root object
• Added method Object3D.forEach()
• DevMaterial now can show non-planar polygons
• DevMaterial now can show polygons, degenerated into a single point
• Fixed bug because of which singular polygons with more than three vertices were indicated incorrectly in DevMaterial
• Now each type of primitive has its own default name
• Fixed bug which led rendering algorithm into endless loop when clipping was disabled
• Added Camera3D.focalLength property
• MouseEvent.view now contains correct viewport reference
• WalkController doesn’t jump continuously when jump key is pressed
• Now in WalkController it is possible to set maximum and minimum pitch angle
• Now FPS counter visibility can be changed