[Bf-committers] Implementing "weight from Bone Glow" as an alternative for "weight from Bone heat" ...

Gaia gaia.clary at machinimatrix.org
Mon Sep 14 20:13:23 CEST 2015

I got a bit scared about implementing this when i looked into it last time.
Because of this i did not dare to touch this topic again until now.
well, i try another round now. But i doubt that i can do it easily.
well, maybe with a bit of help...


On 14.09.2015 09:36, Daniel Salazar - patazstudio.com wrote:
> Hi, what happened to this? Very interested in having this implemented.
> Daniel Salazar
> patazstudio.com
> On Sun, May 3, 2015 at 5:39 AM, Brecht Van Lommel
> <brechtvanlommel at pandora.be> wrote:
>> Hi,
>> On Sun, May 3, 2015 at 12:38 PM, Gaia <gaia.clary at machinimatrix.org> wrote:
>>> 1.) Both algorithms work by first calculating an initial set of weights for a
>>> given skin/skeleton combination, then this initial set is smoothed by
>>> applying a diffusion equation.
>>> 2.) Bone heat and Bone glow differ "only" in the way how they calculate
>>> the initial set of weights. The following diffusion calculation is the same
>>> for both.
>> That seems right.
>>> meshlaplacian.c (line 624): heat_bone_weighting()
>>> I understand it like this:
>>> 654-678 Mask for only working on selected vertices/bones
>>> 680-700 Initial setup of the data for the calculations
>>> 701-720 clear all weights from weight groups
>>> 731     This seems to be where "everything" happensin one step
>>> 732-776 copy the calculated weights to the vertex groups
>>> I believe that i "only" have to modify what happens in line 731, but
>>> my problem is how can i change what happens in that function?
>> The linear system is solved at line 731, but it's only the
>> construction of the system that needs to change.
>> You need to modify heat_set_H where the values heat.H and heat.p are
>> computed, these correspond to the H and p in the original and new
>> paper. At lines 726-728 these values are set into the right hand side
>> of the linear system. The heat_source_closest test there may also need
>> to change if visibility is no longer a binary value.
>> Brecht.
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