[Bf-committers] derived mesh in modifier stack

[Tobias Oelgarte]

I found my problem. The get_ccdm() needs the current vertices's passed 
as the last parameter, then the derived mesh is up to date an can be 
used like the original. Otherwise it is the same as the from the last 
modifier that generated a derived mesh.

Steve Obbayi schrieb:
> Hi Tobias, I've taken a quick peek and it looks like get_dm() and get_cddm() return 
> copies of the original or derived mesh and therefore leave the originals untouched. So i dont 
> think you will find updated vertices from either of these functions.
>
> It only makes sense so that when you remove the modifier it can revert to the original
> mesh. Someone else can hopefully clarify.
>
> Steve Obbayi
>
>
> ----- Original Message -----
> From: "Tobias Oelgarte" <tobias.oelgarte at googlemail.com>
> To: bf-committers at blender.org
> Sent: Sunday, October 10, 2010 6:46:50 PM GMT +03:00 Iraq
> Subject: [Bf-committers] derived mesh in modifier stack
>
> Hi,
>
> As far as i found out, a DerivedMesh is created as soon as some modifier 
> needs to construct its own geometry. There are the utility functions 
> get_dm() and get_cddm() in MOD_util. What is their purpose? I looked at 
> what they are doing and it looked like get_cddm() would ensure a 
> DerivedMesh is created. But somehow it does not update the vertices and 
> normals.
>
> How im supposed to access the vertex normals that would exist after the 
> last modifier worked on them, before my own modifier, if it is just a 
> deform modifier, that does not deliver a new DerivedMesh?
>
> In other words: Can i update the DerivedMesh passed to deformVerts()? Or 
> is there a better way to access the current normal data? Vertices seam 
> not to be updated after get_dm() or get_cddm().
>
> Best wishes Tobias Oelgarte
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