SR3DBuilder is an advanced CAD to create and ANIMATE LEGO models on your PC. Features: Looking at some video worths more than 1000 words Support for PowerFunction and Mindstorm electric cables Improved flex part management Support for Piston - Rod mechanism Support for Linear Actuators and Shock Absorbers Animation Console to easily create and animate your technic models Towball, HINGES and GEARS SUPPORT! Take a look to the Gallery to see what I mean Connection Solver for quick connecting hinges and rotating parts Support for RACKS and steering Support for ANIMATED FLEXYBLE PARTS Belt Generator with real connections Now with GROUP management New exclusive MirrorBuilding features for quick build of symmetric models. MUST TRY !! Enhanced instructions editor to easily modify the order in which bricks are loaded in your model and/or take photos while building Complex gear driven hinges support (quadrilaters deformation and steering) Great fully 3D building envinronment with reflection and transparencies You will see your model during loading time and can pause for instruction steps You can modify and save models (lDraw/MLCad .dat compatible format) Fast selecting/moving/adding/removing you'll never see in MLCad Copy/Rotation/Deletetion/Color change of single or multiple brick. Undo/Redo functionality Real connections detection, not always the same near brick positioning Brick selection by Block (means that solid connected bricks can be selected at once) Grid positioning to speed up positioning of pieces Automatic and precise positioning and orientering of most bricks according to connection detection Automatic detection of rotation axles You can easily load model from other known programs: it supports the following formats: .dat files, .ldr files, .mpd files (only a few metacommand are currently supported)