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Maniphest T47401

Particle System- HAIR and Vertex Groups
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Description

System Information
Pentium(R) Dual-Core Windows 64 bit

Blender Version
Broken: blender 2.75a c27589e

Short description of error

Hair particles are not created in the assigned vertex group, hair is created in all sides of the mesh ignoring the selected group and leaves hairless areas in it. After, the particle edit mode doesn`t show the same order in hair and it´s impossible to comb or add.

Exact steps for others to reproduce the error

Create a Cube, select one face >>Object Data >Vertex group: create a group and assign selected face.

Particles, create particle system, type "Hair" >Vertex group: select created group.

Related Objects

Event Timeline

Ana Bautista (Ana) created this task.Feb 12 2016, 9:34 PM
Ana Bautista (Ana) raised the priority of this task from to 90.
Ana Bautista (Ana) updated the task description. (Show Details)
Ana Bautista (Ana) added a project: Modeling.
Ana Bautista (Ana) edited a custom field.
Ana Bautista (Ana) added a subscriber: Ana Bautista (Ana).
Bastien Montagne (mont29) changed the task status from Unknown Status to Archived.Feb 13 2016, 10:29 AM
Bastien Montagne (mont29) claimed this task.
Bastien Montagne (mont29) added a subscriber: Bastien Montagne (mont29).

Thanks for the report, but see no bug here, vgroups are vertex data, not face data, so when you add 'one face' of a cube to a vgroup, you add half of its vertices which affects five of the six faces… Ideally we could get a varying density of hair following vgroup weight gradient across faces, but that’s not implemented currently and is not a bug anyway.

Note that an easy work around here is to add a (very thin) loop of faces around the region you want to generate particles from (using bevel, inset, etc.), which would serve as boundary for particle distribution.

Evan Wilson (EAW) mentioned this in T77902: Particle system are not working correctly with vertex group.Jun 17 2020, 2:02 AM