Hello, I'm having a problem with Mash. When I connect a cube to a visibility node on my Mash using a falloff, the grass blades are correctly hidden at the cube's location. However, when I do the same with an animated ABC or a model that I blend shape onto the ABC, it doesn't work. All the grass disappears. I'm using the same settings, though.
I've also tried changing them, but the grass doesn't reappear. Does anyone have any ideas?
I'm also using a script to automatically generate my connections:
import maya.cmds as mc
from projectConfig.mayaConfig import MAYA_ROOT
def get_mash_visibility_nodes():
return mc.ls(type="MASH_Visibility", recursive=True)
def get_mash_python_nodes():
return mc.ls(type="MASH_Python", recursive=True)
def get_char_props_mesh():
list_shape = []
list_main_grps = [
f'{MAYA_ROOT["long_name"]}|PRP|SURF',
f'{MAYA_ROOT["long_name"]}|PROP|SURF',
f'{MAYA_ROOT["long_name"]}|CHAR|SURF',
f'{MAYA_ROOT["long_name"]}|CHAR|GROOM',
f'{MAYA_ROOT["long_name"]}|VEH|SURF',
f'{MAYA_ROOT["long_name"]}|VEG|SURF',
f'{MAYA_ROOT["long_name"]}|VEGET|SURF',
]
for grp in list_main_grps:
if mc.objExists(grp):
for shape in mc.listRelatives(grp, allDescendents=True, fullPath=True):
if 'CHAR' in shape and 'body' in shape and 'Shape' in shape and 'GEO' in shape:
if not 'href' in shape:
list_shape.append(shape)
elif 'CHAR' in shape and 'Body' in shape and 'Shape' in shape and 'GEO' in shape:
if not 'href' in shape:
list_shape.append(shape)
elif 'CHAR' in shape and 'cloth' in shape and 'Shape' in shape and 'GEO' in shape:
list_shape.append(shape)
else:
if not 'CHAR' in shape and 'Shape' in shape:
list_shape.append(shape)
return list_shape
def get_mash_python_node(mash_vis):
mash_python = mash_vis.replace("Visibility", "Python")
if mc.objExists(mash_python):
return mash_python
else:
return None
def add_mash_falloff(mash_vis, mash_python, list_shapes, search_radius=1.0, inner_radius=0.3):
created_falloffs = []
if not mash_python:
return None
for shape in list_shapes:
if mc.objExists(shape):
print(shape)
try:
idx = list_shapes.index(shape)
trs = mc.listRelatives(shape, parent=True, fullPath=True)[0]
meshName = trs.split('|')[-1].split(':')[-1].replace("msh", "")
falloff_name = mash_vis.split(':')[-1].replace("Visibility_scene", 'Falloff') + meshName + '_' + str(idx)
falloff_trs = mc.createNode('transform', name=falloff_name)
falloff_node = mc.createNode("MASH_Falloff", name=falloff_name+'Shape', parent=falloff_trs)
mc.setAttr(f"{falloff_node}.falloffShape", 6)
mc.setAttr(f"{falloff_node}.invertFalloff", True)
mc.setAttr(f"{falloff_node}.excludeInterior", False)
mc.setAttr(f"{falloff_node}.searchRadius", search_radius)
mc.setAttr(f"{falloff_node}.innerRadius", inner_radius)
mc.setAttr(f"{falloff_node}.meshMode", 1)
mc.connectAttr(f"{shape}.worldMesh", f"{falloff_node}.shapeIn")
mc.connectAttr(f"{trs}.worldMatrix", f"{falloff_node}.shapeMatrix")
mc.connectAttr(f"{mash_python}.outputPoints", f"{falloff_node}.falloffIn")
mc.connectAttr(f"{falloff_node}.falloffOut", f"{mash_vis}.strengthPP[{idx}]")
created_falloffs.append(falloff_node)
except Exception as e:
print(e)
pass
return created_falloffs
def create_scene_vis_mash(mash_vis):
new_vis_name = mash_vis.split(':')[-1]+'_scene'
visibility_node = mc.createNode("MASH_Visibility", name=new_vis_name)
waiter_node = mash_vis.replace('_Visibility', '')
mc.connectAttr(f"{visibility_node}.outputPoints", f"{waiter_node}.inputPoints", force=True)
mc.connectAttr(f"{mash_vis}.outputPoints", f"{visibility_node}.inputPoints", force=True)
return visibility_node
def connect_cam_to_mash(mash_vis):
mc.setAttr(f"{mash_vis}.enableFrustum", 1)
mc.setAttr(f"{mash_vis}.useFilmGate", 0)
mc.setAttr(f"{mash_vis}.frustumBorder", 1.5)
for camera in mc.ls(type="camera", long=True, recursive=True):
if 'ROOT' in camera:
mc.connectAttr(f"{camera}.message", f"{mash_vis}.camera", force=True)
break
def mask_mash():
for mash_vis in get_mash_visibility_nodes():
connect_cam_to_mash(mash_vis)
python_node = get_mash_python_node(mash_vis)
vis_scene = create_scene_vis_mash(mash_vis)
add_mash_falloff(vis_scene, python_node, get_char_props_mesh())
mask_mash()
