step dist calculation ok

OP_animate_path.py

@@ -1,6 +1,7 @@
 import bpy
 from . import fn
 from mathutils import Vector, Euler
+from mathutils.geometry import intersect_line_plane
 ## step 2 : Auto animate the path (with feet selection) and modal to adjust speed
 
 def get_bone_transform_at_frame(b, act, frame):
@@ -11,12 +12,12 @@ def get_bone_transform_at_frame(b, act, frame):
         for i in range(3):
             f = act.fcurves.find(f'pose.bones["{b.name}"].{channel}', index=i)
             if not f:
-                print(frame, channel, 'not animated ! using current value')
+                # print(frame, channel, 'not animated ! using current value') # Dbg
                 chan_list.append(getattr(b, channel)) # get current value since not animated
                 continue
             chan_list.append(f.evaluate(frame))
         
-        print(frame, b.name, channel, chan_list)
+        # print(frame, b.name, channel, chan_list) # Dbg
         if channel == 'rotation_euler':
             transform[channel] = Euler(chan_list)
         else:
@@ -26,10 +27,11 @@ def get_bone_transform_at_frame(b, act, frame):
 
 
 def anim_path_from_translate():
+    '''Calculate step size from selected foot and forward axis and animate curve'''
     print(fn.helper())
 
-    obj = bpy.context.object
-    if obj.type != 'ARMATURE':
+    ob = bpy.context.object
+    if ob.type != 'ARMATURE':
         return ('ERROR', 'active is not an armature type')
 
     # found curve through constraint
@@ -37,20 +39,24 @@ def anim_path_from_translate():
 
     # if not 'foot' in b.bone.name:
     #     return ('ERROR', 'No "foot" in active bone name\n-> Select foot that has the most reliable contact')
-
+    settings = bpy.context.scene.anim_cycle_settings
+    axis = settings.forward_axis
     curve = None
-    if bpy.context.scene.anim_cycle_settings.path_to_follow:
-        curve = bpy.context.scene.anim_cycle_settings.path_to_follow
+    if settings.path_to_follow:
+        curve = settings.path_to_follow
+
+    if curve and not bpy.context.scene.objects.get(curve.name):
+        return 'ERROR', f'Curve {curve.name} is not in scene'
 
     # if curve is not defined try to track it from constraints on armature
     if not curve:
-        curve, _const = fn.get_follow_curve_from_armature(obj)
+        curve, _const = fn.get_follow_curve_from_armature(ob)
         if isinstance(curve, str):
             return curve, _const
 
-    act = fn.get_obj_action(obj)
+    act = fn.get_obj_action(ob)
     if not act:
-        return ('ERROR', f'No action active on {obj.name}')
+        return ('ERROR', f'No action active on {ob.name}')
     
     # use original action as ref
     if '_expanded' in act.name:
@@ -104,32 +110,91 @@ def anim_path_from_translate():
                     break
 
     if start_frame is None or end_frame is None:
-        return ('ERROR', f'No (or not enough) keyframe marked Extreme {obj.name} > {b.name}')
+        return ('ERROR', f'No (or not enough) keyframe marked Extreme {ob.name} > {b.name}')
     if start_frame == end_frame:
        return ('ERROR', f'Only one key detected as extreme (at frame {start_frame}) !\nNeed at least two chained marked keys')
 
     print(f'Offset from key range. start: {start_frame} - end: {end_frame}')
     move_frame = end_frame - start_frame
 
-
-
     ## Find move_val from diff position at start and end frame wihtin character forward axis
 
-    
     start_transform = get_bone_transform_at_frame(b, act, start_frame)
     start_mat = fn.compose_matrix(start_transform['location'], start_transform['rotation_euler'], start_transform['scale'])
 
     end_transform = get_bone_transform_at_frame(b, act, end_frame)
     end_mat = fn.compose_matrix(end_transform['location'], end_transform['rotation_euler'], end_transform['scale'])
 
-    # bpy.context.scene.cursor.location = (b.bone.matrix_local @ start_mat).to_translation() # obj.matrix_world @ 
-    bpy.context.scene.cursor.location = (b.bone.matrix_local @ end_mat).to_translation() # obj.matrix_world @ 
-    # bpy.context.scene.cursor.location = (b.matrix_basis.inverted() @ start_mat).to_translation() # obj.matrix_world @ 
-    # bpy.context.scene.cursor.location =  start_transform['location'] # obj.matrix_world @ 
-    return # FIXME
 
-    ### old method using directly one axis
-    """
+    ## Determine direction vector of the charater (root)
+    orient_vectors = {
+    'FORWARD_X' : Vector((1,0,0)),
+    'FORWARD_Y' : Vector((0,1,0)),
+    'FORWARD_Z' : Vector((0,0,1)),
+    'TRACK_NEGATIVE_X' : Vector((-1,0,0)),
+    'TRACK_NEGATIVE_Y' : Vector((0,-1,0)),
+    'TRACK_NEGATIVE_Z' : Vector((0,0,-1))
+    }
+
+    ## TODO root need to be user defined
+    root = ob.pose.bones.get('world')
+    if not root:
+        print('No root found')
+        return {"CANCELLED"}
+
+    root_axis_vec = orient_vectors[axis] # world space
+    root_axis_vec = root.bone.matrix_local @ root_axis_vec # aligned with object
+    # bpy.context.scene.cursor.location = root_axis_vec # Dbg root direction
+
+    ## Get difference between start_loc and ends loc on forward axis
+    start_loc = (b.bone.matrix_local @ start_mat).to_translation()
+    end_loc = (b.bone.matrix_local @ end_mat).to_translation()
+    # bpy.context.scene.cursor.location = start_loc # Dbg foot start position
+   
+    print('root vec : ', root_axis_vec)
+    print('start loc: ', start_loc)
+    
+
+    ##  get distance on forward axis
+    move_val = (intersect_line_plane(start_loc, start_loc + root_axis_vec, end_loc, root_axis_vec) - start_loc).length
+    print('move_val: ', move_val)
+
+    length = fn.get_curve_length(curve)    
+    
+    steps = length / move_val
+
+    frame_duration = int(steps * move_frame)
+
+    ## Clear 'eval_time' keyframe before creating new ones # curve.data.animation_data_clear() # too much.. delete only eval_time
+    if curve.data.animation_data and curve.data.animation_data.action:
+        for fcu in curve.data.animation_data.action.fcurves:
+            if fcu.data_path == 'eval_time':
+                curve.data.animation_data.action.fcurves.remove(fcu)
+                break
+    
+    ## add eval time animation on curve
+    anim_frame = settings.start_frame
+    curve.data.path_duration = frame_duration
+    curve.data.eval_time = 0
+    curve.data.keyframe_insert('eval_time', frame=anim_frame) # , options={'INSERTKEY_AVAILABLE'}
+    
+    curve.data.eval_time = frame_duration
+    curve.data.keyframe_insert('eval_time', frame=anim_frame + frame_duration)
+
+    ## all to linear (will be set to CONSTANT at the moment of sampling)
+    for fcu in curve.data.animation_data.action.fcurves:
+        if fcu.data_path == 'eval_time':
+            for k in fcu.keyframe_points:
+                k.interpolation = 'LINEAR'
+    
+    ## set all to constant
+    # for k in t_fcu.keyframe_points:
+    #     k.interpolation = 'CONSTANT'
+
+    print('end of set_follow_path_anim')
+
+
+    """ ### old method using directly one axis
     axis = {'X':0, 'Y':1, 'Z':2}
     ## calculate offset from bones
     loc_fcu = None
@@ -177,43 +242,6 @@ def anim_path_from_translate():
     """
     
 
-    print('move_val: ', move_val)
-
-    length = fn.get_curve_length(curve)    
-    
-    steps = length / move_val
-
-    frame_duration = steps * move_frame
-
-
-    ### Clear keyframe before creating new ones 
-    # curve.data.animation_data_clear() # too much.. delete only eval_time
-    if curve.data.animation_data and curve.data.animation_data.action:
-        for fcu in curve.data.animation_data.action.fcurves:
-            if fcu.data_path == 'eval_time':
-                curve.data.animation_data.action.fcurves.remove(fcu)
-                break
-
-    anim_frame = bpy.context.scene.anim_cycle_settings.start_frame
-    curve.data.path_duration = frame_duration
-    curve.data.eval_time = 0
-    curve.data.keyframe_insert('eval_time', frame=anim_frame)# , options={'INSERTKEY_AVAILABLE'}
-    
-    curve.data.eval_time = frame_duration
-    curve.data.keyframe_insert('eval_time', frame=anim_frame + frame_duration)
-
-    ## all to linear (will be set to CONSTANT at the moment of sampling)
-    for fcu in curve.data.animation_data.action.fcurves:
-        if fcu.data_path == 'eval_time':
-            for k in fcu.keyframe_points:
-                k.interpolation = 'LINEAR'
-    
-    ## set all to constant
-    # for k in t_fcu.keyframe_points:
-    #     k.interpolation = 'CONSTANT'
-
-    print('end of set_follow_path_anim')
-
 class UAC_OT_animate_path(bpy.types.Operator):
     bl_idname = "anim.animate_path"
     bl_label = "Animate Path"

OP_setup.py

@@ -27,7 +27,7 @@ class UAC_OT_autoset_axis(bpy.types.Operator):
     def execute(self, context):
         ob = context.object
 
-        ## root need to be user defined to assume corner cases
+        ## TODO root need to be user defined to assume corner cases
         root = ob.pose.bones.get('world')
         if not root:
             print('No root found')

README.md

@@ -39,6 +39,10 @@ Sidebar > Anim > unfold anim cycle
 
 ## Changelog:
 
+0.3.5
+
+- partly working
+
 0.3.3
 
 - total wip

__init__.py

@@ -2,7 +2,7 @@ bl_info = {
     "name": "Unfold Anim Cycle",
     "description": "Anim tools to develop walk/run cycles along a curve",
     "author": "Samuel Bernou",
-    "version": (0, 3, 3),
+    "version": (0, 3, 5),
     "blender": (3, 0, 0),
     "location": "View3D",
     "warning": "WIP",

properties.py

@@ -17,11 +17,12 @@ class UAC_PG_settings(bpy.types.PropertyGroup) :
     
     expand_on_selected_bones : bpy.props.BoolProperty(
         name="On selected", description="Expand on selected bones",
-        default=True, options={'HIDDEN'})
+        default=False, options={'HIDDEN'})
     
     linear : bpy.props.BoolProperty(
-        name="Linear", description="keep the animation path linear (Else step the path usings cycle keys)",
-        default=False, options={'HIDDEN'})
+        name="Linear", description="keep the animation path linear\
+            \nElse step the path usings follow path cycle keys)",
+        default=True, options={'HIDDEN'})
 
     start_frame : bpy.props.IntProperty(
         name="Start Frame", description="Starting frame for animation path",