Finished rudimentary avatar setup

blender_driver_func.py

@@ -0,0 +1,73 @@
+# from mathutils import *
+from math import *
+import bpy
+
+
+def angle_to_length(angle: float, target: float = 1.0) -> float:
+    """
+    Converts input angle to distance between two points in imaginary isosceles triangle with default angle of 180deg(!).
+    The distance is clamped to the target value.
+
+    :param angle: Input angle (in radians)
+    :type angle: float
+    :param target: Desired distance between end points, defaults to 1.0
+    :type target: float, optional
+    :return: The distance between two points
+    :rtype: float
+    """
+    if angle > 0:
+        return (target * 0.5 * sin(pi - angle)) / sin(angle * 0.5)  # School trigonometry
+    else:
+        return target
+
+
+def half_angle_to_length(angle: float, target: float = 1.0) -> float:
+    """
+    Converts input angle to distance between two points in imaginary isosceles triangle with default angle of 90deg.
+    The distance is clamped to the target value.
+
+    :param angle: Input angle (in radians)
+    :type angle: float
+    :param target: Desired distance between end points, defaults to 1.0
+    :type target: float, optional
+    :return: The distance between two points
+    :rtype: float
+    """
+    side = sqrt(pow(target, 2) * 0.5)  # Length of imaginary triangle's side
+    angle = abs(pi * 0.5 - angle)  # Default angle is 90deg
+    return (side * sin(angle)) / sin((pi - angle) * 0.5)
+
+
+def half_elbow_compensation(angle: float) -> float:
+    side = sqrt(pow(pi * 0.25, 2) * 0.5)  # Length of imaginary triangle's side
+    angle = abs(angle)
+    final_angle = (side * sin(angle)) / sin((pi - angle) * 0.5)  # Width of imaginary triangle's base
+    return sqrt(pow(tan(final_angle), 2) + 1) - 1  # What the fuck??
+
+
+def compensated_elbow_corner(frame: float, offset: float = 0.125) -> float:
+    # min(0.125, 0.125 * tan(acos(1 - frame / 180)))
+    c_angle = acos(1 - frame / 180)
+    return min(offset, offset * tan(c_angle))
+
+
+def compensated_elbow_crease(frame: float, offset_1: float = 0.0625, offset_2: float = 0.125) -> float:
+    # min(0.0625, 0.0625 * tan(acos(1 - frame / 180))) + 0.125 * tan(max(acos(1 - frame / 180) - pi / 4, 0))
+    c_angle = acos(1 - frame / 180)
+    first_stage = min(offset_1, offset_1 * tan(c_angle))
+    second_stage = (tan(max(c_angle - pi / 4, 0)) * offset_2)
+    return first_stage + second_stage
+
+
+def compensated_elbow_corner_2(frame: float, offset: float = 0.125) -> float:
+    # 0.125 * (sqrt(pow(tan(acos(1 - frame / 180)), 2) + 1) - 1)
+    c_angle = acos(1 - frame / 180)
+    return offset * (sqrt(pow(tan(c_angle), 2) + 1) - 1)
+
+
+bpy.app.driver_namespace["angle_to_length"] = angle_to_length
+bpy.app.driver_namespace["half_angle_to_length"] = half_angle_to_length
+bpy.app.driver_namespace["half_elbow_compensation"] = half_elbow_compensation
+bpy.app.driver_namespace["compensated_elbow_corner"] = compensated_elbow_corner
+bpy.app.driver_namespace["compensated_elbow_corner_2"] = compensated_elbow_corner_2
+bpy.app.driver_namespace["compensated_elbow_crease"] = compensated_elbow_crease