I have set up a simple car like model in blender 2.8

I have now set up a rigid body so I can simulate simple physics

1. Main Block - Active Rigid Body
2. Wheel - Active Rigid Body
3. Empty - Rigid Body Constrained

This exactly works as expected until now.....

But I need to control the vehicle via a python script (Apply a rotation/force to the 4 wheels)

Therefore I've set up the following script

import bpy, time

# get the 4 wheels
wheels = [bpy.data.objects['WheelFrontLeft'], 
    bpy.data.objects['WheelBackLeft'], 
    bpy.data.objects['WheelBackRight'], 
    bpy.data.objects['WheelFrontRight']]

for wheel in wheels: 
    wheel.animation_data_clear() # clear keyframes
    wheel.rotation_euler[1] = 0 # reset rotation

for i in range(1,50): # step through 50 frames
    bpy.context.scene.frame_set(i)
    for wheel in wheels: # iterate wheels
        wheel.rotation_euler[1] += 15 # rotate +15 
        wheel.keyframe_insert(data_path="rotation_euler", frame=i) # insert keyframe

Unfortunately this does not change anything...

After running the script I got a totally messed up scene (everything is wrong positioned/rotated) and if I restart the animation, the vehicle just keeps falling (Only the Rigid body simulation applies without the rotation)

So I don't see any rotation at all. Only when I'm checking the animation checkbox (for the active rigid body wheels), the wheels are moving. In that case the car is not falling anymore (physics won't be applied). Obviously that is an either or switch for physics/animation

I also tried setting the empty constraint type to Motor instead of Fixed but then it just falls apart....

Also rotating the constraints does not help at all....

What am I doing wrong? How can I fix this?

I have set up a simple car like model in blender 2.8

I have now set up a rigid body so I can simulate simple physics

1. Main Block - Active Rigid Body
2. Wheel - Active Rigid Body
3. Empty - Rigid Body Constrained

This exactly works as expected. When I set the constraint to Hinge, also the wheels are turning when the vehicle rolls down a test plane)

But I need to control the vehicle via a python script (Apply a rotation/force to the 4 wheels)

Therefore I've set up the following script

import bpy, time

# get the 4 wheels
wheels = [bpy.data.objects['WheelFrontLeft'], 
    bpy.data.objects['WheelBackLeft'], 
    bpy.data.objects['WheelBackRight'], 
    bpy.data.objects['WheelFrontRight']]

for wheel in wheels: 
    wheel.animation_data_clear() # clear keyframes
    wheel.rotation_euler[1] = 0 # reset rotation

for i in range(1,50): # step through 50 frames
    bpy.context.scene.frame_set(i)
    for wheel in wheels: # iterate wheels
        wheel.rotation_euler[1] += 15 # rotate +15 
        wheel.keyframe_insert(data_path="rotation_euler", frame=i) # insert keyframe

Unfortunately this does not change anything...

After running the script I got a totally messed up scene (everything is wrong positioned/rotated) and if I restart the animation, the vehicle just keeps falling (Only the Rigid body simulation applies without the rotation)

So I don't see any rotation at all. Only when I'm checking the animation checkbox (for the active rigid body wheels), the wheels are moving. In that case the car is not falling anymore (physics won't be applied). Obviously that is an either or switch for physics/animation

I also tried setting the empty constraint type to Motor instead of Fixed but then it just falls apart....

Also rotating the constraints does not help at all....

What am I doing wrong? How can I fix this?

I have set up a simple car like model in blender 2.8

I have now set up a rigid body so I can simulate simple physics

1. Main Block - Active Rigid Body
2. Wheel - Active Rigid Body
3. Empty - Rigid Body Constrained

This exactly works as expected until now.....

But I need to control the vehicle via a python script (Apply a rotation/force to the 4 wheels)

Therefore I've set up the following script

import bpy, time

wheels = [bpy.data.objects['WheelFrontLeft'], bpy.data.objects['WheelBackLeft'], bpy.data.objects['WheelBackRight'], bpy.data.objects['WheelFrontRight']]

for wheel in wheels: 
    wheel.animation_data_clear() # clear keyframes
    wheel.rotation_euler[1] = 0 # reset rotation

for i in range(1,50): # step through 50 frames
    bpy.context.scene.frame_set(i)
    for wheel in wheels: # iterate wheels
        wheel.rotation_euler[1] += 15 # rotate +15 
        wheel.keyframe_insert(data_path="rotation_euler", frame=i) # insert keyframe

Unfortunately this does not change anything...

After running the script I got a totally messed up scene (everything is wrong positioned/rotated) and if I restart the animation, the vehicle just keeps falling (Only the Rigid body simulation applies without the rotation)

So I don't see any rotation at all. Only when I'm checking the animation checkbox (for the active rigid body wheels), the wheels are moving. In that case the car is not falling anymore (physics won't be applied). Obviously that is an either or switch for physics/animation

I also tried setting the empty constraint type to Motor instead of Fixed but then it just falls apart....

Also rotating the constraints does not help at all....

What am I doing wrong? How can I fix this?

I have set up a simple car like model in blender 2.8

I have now set up a rigid body so I can simulate simple physics

1. Main Block - Active Rigid Body
2. Wheel - Active Rigid Body
3. Empty - Rigid Body Constrained

This exactly works as expected until now.....

But I need to control the vehicle via a python script (Apply a rotation/force to the 4 wheels)

Therefore I've set up the following script

import bpy, time

# get the 4 wheels
wheels = [bpy.data.objects['WheelFrontLeft'], 
    bpy.data.objects['WheelBackLeft'], 
    bpy.data.objects['WheelBackRight'], 
    bpy.data.objects['WheelFrontRight']]

for wheel in wheels: 
    wheel.animation_data_clear() # clear keyframes
    wheel.rotation_euler[1] = 0 # reset rotation

for i in range(1,50): # step through 50 frames
    bpy.context.scene.frame_set(i)
    for wheel in wheels: # iterate wheels
        wheel.rotation_euler[1] += 15 # rotate +15 
        wheel.keyframe_insert(data_path="rotation_euler", frame=i) # insert keyframe

Unfortunately this does not change anything...

After running the script I got a totally messed up scene (everything is wrong positioned/rotated) and if I restart the animation, the vehicle just keeps falling (Only the Rigid body simulation applies without the rotation)

So I don't see any rotation at all. Only when I'm checking the animation checkbox (for the active rigid body wheels), the wheels are moving. In that case the car is not falling anymore (physics won't be applied). Obviously that is an either or switch for physics/animation

I also tried setting the empty constraint type to Motor instead of Fixed but then it just falls apart....

Also rotating the constraints does not help at all....

What am I doing wrong? How can I fix this?