Presets for hair dynamics.

This is necessary because the hair dynamics settings are not part of the
ParticleSettings datablock, but part of the convoluted cloth modifier
inside the particle system struct. In the future this will be recoded
properly, but in the meantime presets provide a simple an unobtrusive
way to have reusable dynamics settings for hair.

Conflicts:
	release/scripts/startup/bl_ui/properties_particle.py

release/scripts/presets/hair_dynamics/default.py

@@ -0,0 +1,17 @@
+import bpy
+psys = bpy.context.particle_system
+cloth = bpy.context.particle_system.cloth
+settings = bpy.context.particle_system.cloth.settings
+collision = bpy.context.particle_system.cloth.collision_settings
+
+settings.quality = 5
+settings.mass = 0.30000001192092896
+settings.bending_stiffness = 0.5
+psys.settings.bending_random = 0.0
+settings.bending_damping = 0.5
+settings.air_damping = 1.0
+settings.internal_friction = 0.0
+settings.density_target = 0.0
+settings.density_strength = 0.0
+settings.voxel_cell_size = 0.10000000149011612
+settings.pin_stiffness = 0.0

release/scripts/startup/bl_operators/presets.py

@@ -365,6 +365,36 @@ class AddPresetFluid(AddPresetBase, Operator):
     preset_subdir = "fluid"
 
 
+class AddPresetHairDynamics(AddPresetBase, Operator):
+    """Add or remove a Hair Dynamics Preset"""
+    bl_idname = "particle.hair_dynamics_preset_add"
+    bl_label = "Add Hair Dynamics Preset"
+    preset_menu = "PARTICLE_MT_hair_dynamics_presets"
+
+    preset_defines = [
+        "psys = bpy.context.particle_system",
+        "cloth = bpy.context.particle_system.cloth",
+        "settings = bpy.context.particle_system.cloth.settings",
+        "collision = bpy.context.particle_system.cloth.collision_settings",
+    ]
+
+    preset_subdir = "hair_dynamics"
+
+    preset_values = [
+        "settings.quality",
+        "settings.mass",
+        "settings.bending_stiffness",
+        "psys.settings.bending_random",
+        "settings.bending_damping",
+        "settings.air_damping",
+        "settings.internal_friction",
+        "settings.density_target",
+        "settings.density_strength",
+        "settings.voxel_cell_size",
+        "settings.pin_stiffness",
+        ]
+
+
 class AddPresetSunSky(AddPresetBase, Operator):
     """Add or remove a Sky & Atmosphere Preset"""
     bl_idname = "lamp.sunsky_preset_add"

release/scripts/startup/bl_ui/properties_particle.py

@@ -63,6 +63,14 @@ def particle_get_settings(context):
     return None
 
 
+class PARTICLE_MT_hair_dynamics_presets(Menu):
+    bl_label = "Hair Dynamics Presets"
+    preset_subdir = "hair_dynamics"
+    preset_operator = "script.execute_preset"
+    COMPAT_ENGINES = {'BLENDER_RENDER', 'BLENDER_GAME'}
+    draw = Menu.draw_preset
+
+
 class ParticleButtonsPanel():
     bl_space_type = 'PROPERTIES'
     bl_region_type = 'WINDOW'
@@ -308,6 +316,11 @@ class PARTICLE_PT_hair_dynamics(ParticleButtonsPanel, Panel):
 
         layout.enabled = psys.use_hair_dynamics and psys.point_cache.is_baked is False
 
+        row = layout.row(align=True)
+        row.menu("PARTICLE_MT_hair_dynamics_presets", text=bpy.types.PARTICLE_MT_hair_dynamics_presets.bl_label)
+        row.operator("particle.hair_dynamics_preset_add", text="", icon='ZOOMIN')
+        row.operator("particle.hair_dynamics_preset_add", text="", icon='ZOOMOUT').remove_active = True
+
         split = layout.column()
 
         col = split.column()