[Bf-committers] Proposed Noise Modifier

metalliandy metalliandy666 at googlemail.com
Sat Feb 15 22:18:56 CET 2014

This is something I have been waiting for in Blender for a very long 
time. Currently if you want to add noise to a mesh you need to use 
displacement and a texture. Even if it only reduces this step it would 
be well worth it because the displacement modifier is really slow.

Can't wait to test this out.



On 15/02/2014 21:01, Patrice Gmail wrote:
> Hello,  I have submitted a patch for a proposed "noise modifier". Hope
> it gets some (positive) feedback !   And a question regarding deform vs
> non-deform modifier is included at the end.   Many thanks.
> Here's what it does:
> The "Noise Modifier" will make it possible to add some randomness into
> mesh objects, duplicated objects and arrays of objects.
> It may be used in one of three modes, or scopes.
> In vertex mode, each individual vertex will be shifted by a random
> amount, somewhere between zero and the set maximum. The probability that
> a given vertex is altered can be defined, and the scope of the modifier
> can be limited to a vertex group, with vertex weight acting as a
> multiplier to the translation.
> In whole mesh mode, the mesh is transformed as a whole, while it's
> origin remains. Transformation may be a combination of translation,
> rotation and scaling. This is mostly useful when duplicating objects,
> either with Shift-D or Alt-D. However, for each object to have it's own
> random transformation, the "Use ID as seed" checkbox must be used.
> Finally, the loose parts mode is used mostly with arrays of objects.
> Indeed, this appears to be the only way one can add randomness into
> arrays, due to the way the modifier stack operates. Each loose part,
> i.e. set of vertices connected by edges, will be transformed as a whole.
> I do have one area where I would like the advice of experienced
> developpers, that is whether to make it a deform or a non-deform
> modifier. In theory, it is deform only, meaning vertices are just moved
> around, never created, and neither are edges and faces. But deform-only
> modifiers receive as input an array of vertex coordinates, not the
> actual BMVert objects. For Vertex mode and Whole Mesh Mode, I could do
> with a deform-only modifier, which is probably a lighter modifier in
> terms of memory usage. But for loose parts mode, I need to identify
> loose parts by walking the mesh through BMW_CONNECTED_VERTEX, which I
> did not manage to do with deform-only. So I switched to non-deform
> modifier. Don't know exactly how much of an issue this is.
> Other than this, the only features that are not included at this point
> is rotation and scaling in loose parts mode. It will require finding the
> bounding box center for each loose part.
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