Value fwd_mps converts global velocity into a velocity vector which is rotated to cars local coordinate system (in this example x-axis).
Then if key "ui_down" is pressed and the fwd_mps value is greater or equal to -1 (which seems to be very good spot and represents car still moving forward but nearly standing still) the car reverses (negative engine_force_value). If this condition isn't met (which means the car is moving forward) then the car brakes.
Tested and working on Godot 3.1 Beta 3.
Suggestions:
In this case, if you want something more realistic, the -engine_force_value can be much lower because no car reverses in same speed as it goes forward but for the sake of demo project I left it as it is.
Created for my own project with help of user wombatstampede from godotdevelopers.org/forum
The scripts were streamlined using more or less the following conventions:
- space after a comma in lists of arguments
- space around weak operators (+, -), no space around strong operators (*, /)
- space after a comment start (#)
- removed trailing spaces or tabs, apart from those that delimit the function indentation level (those could be removed too but since they are added automatically by the editor when typing code, keeping them for now)
- function blocks separate by two newlines
The scene files were resaved with the (current) 2.0 format, and some scenes that were in XML format were converted to SCN, to be consistent across all demos.
-=-=-=-=-=-=-=-=-=-=-
-Fixes to Collada Exporter (avoid crash situtions)
-Fixed to Collada Importer (Fixed Animation Optimizer Bugs)
-Fixes to RigidBody/RigidBody2D body_enter/body_exit, was buggy
-Fixed ability for RigidBody/RigidBody2D to get contacts reported and bodyin/out in Kinematic mode.
-Added proper trigger support for 3D Physics shapes
-Changed proper value for Z-Offset in OmniLight
-Fixed spot attenuation bug in SpotLight
-Fixed some 3D and 2D spatial soudn bugs related to distance attenuation.
-Fixed bugs in EventPlayer (channels were muted by default)
-Fix in ButtonGroup (get nodes in group are now returned in order)
-Fixed Linear->SRGB Conversion, previous algo sucked, new algo works OK
-Changed SRGB->Linear conversion to use hardware if supported, improves texture quality a lot
-Fixed options for Y-Fov and X-Fov in camera, should be more intuitive.
-Fixed bugs related to viewports and transparency
Huge Amount of New Stuff:
-=-=-=-=-=-=-=-==-=-=-=-
-Ability to manually advance an AnimationPlayer that is inactive (with advance() function)
-More work in WinRT platform
-Added XY normalmap support, imports on this format by default. Reduces normlmap size and enables much nice compression using LATC
-Added Anisotropic filter support to textures, can be specified on import
-Added support for Non-Square, Isometric and Hexagonal tilemaps in TileMap.
-Added Isometric Dungeon demo.
-Added simple hexagonal map demo.
-Added Truck-Town demo. Shows how most types of joints and vehicles are used. Please somebody make a nicer town, this one is too hardcore.
-Added an Object-Picking API to both RigidBody and Area! (and relevant demo)
Ivan Kmeťo
Chris Bradfield
Bastiaan Olij
Juan Linietsky
Rémi Verschelde