[Bf-committers] In need for help/documentation for modifiers
Jorge Bernal
jbernalmartinez at gmail.com
Fri Oct 8 14:40:08 CEST 2010
Hi,
Check this link:
http://www.blender.org/development/architecture/notes-on-sdna/
Regards,
Jorge
2010/10/8 Tobias Oelgarte <tobias.oelgarte at googlemail.com>
> So far i edited 10 different places. But if i try to compile it, i get
> this confusing error message from makesdna:
>
> ...
> scons:
> `/media/Trekstor_01/temp/blender-trunk/build/linux2/lib/libbf_imbuf.a'
> is up to date.
> "/media/Trekstor_01/temp/blender-trunk/build/linux2/makesdna"
>
> /media/Trekstor_01/temp/blender-trunk/build/linux2/source/blender/makesdna/intern/dna.c
> Running makesdna at debug level 0
> Program version: $Id: makesdna.c 31990 2010-09-18 03:46:13Z
> campbellbarton $
> Sizeerror 8 in struct: RestoreVolumeModifierData (add 4 bytes)
> scons: ***
>
> [/media/Trekstor_01/temp/blender-trunk/build/linux2/source/blender/makesdna/intern/dna.c]
> Error 1
> scons: building terminated because of errors.
>
> So far as i read the code, it checks if the struct has the correct size.
> But is something wrong with my struct? I can't see it:
>
> from DNA_modifier_types.h:
> typedef struct RestoreVolumeModifierData {
> ModifierData modifier;
> // own data
> float volume; /* volume that mesh should have after
> applying modifier */
> char name[32]; /* name of vertexgroup that defines wich
> areas can grow/shrink */
> } RestoreVolumeModifierData;
>
>
>
> Phil Gosch schrieb:
> > Hi, I found this link pretty helpful:
> >
> > http://enja.org/2010/05/24/blender-creating-a-custom-modifier/
> >
> > Best wishes, phil (SaphireS)
> >
> > Am 08.10.2010 12:44, schrieb Tobias Oelgarte:
> >
> >> At least this is some starting point. A simple documentation on this
> >> could be really handy. I will try to setup a basic modifier and see if i
> >> run in any trouble. If so, i will ask back, since this could also be
> >> helpfull, if you decide to write a documentation on this. For now i will
> >> spend my time to read more into the code.
> >>
> >> Thank you. Without this i might have searched for hours/days and
> >> probably given up frustrated.
> >>
> >> Jeroen Bakker schrieb:
> >>
> >>> Hi,
> >>>
> >>> I have a small step by step mind dump, but have not yet had time to
> >>> write the complete documentation about it. see below. there is also a
> >>> developer website who mentions it, but cannot find it right now.
> >>>
> >>> Add custom modifier
> >>> 1. DNA_modifier_types.h --> add ModifierType enumeration (must start
> >>> with eModifierType_[NAME])
> >>> 2. DNA_modifier_types.h --> Add [NAME]ModifierData struct. first field
> >>> must be ModifierData modifier
> >>> 3. rna_modifier.c --> {eModifierType_[NAME], "[NAME]",
> >>> ICON_MOD_PHYSICS, "Surface", ""},
> >>>
> >>> static void rna_def_modifier_test(BlenderRNA *brna)
> >>> {
> >>> StructRNA *srna;
> >>>
> >>> srna= RNA_def_struct(brna, "TestModifier", "Modifier");
> >>> RNA_def_struct_ui_text(srna, "Test Modifier", "just a test");
> >>> RNA_def_struct_sdna(srna, "TestModifierData");
> >>> RNA_def_struct_ui_icon(srna, ICON_MOD_PARTICLES);
> >>> }
> >>> add sdna fields
> >>> static StructRNA* rna_Modifier_refine(struct PointerRNA *ptr)
> >>> add case
> >>>
> >>> call method from register
> >>>
> >>> 4 modifier.c
> >>> mti = INIT_TYPE(Test);
> >>> mti->type = eModifierTypeType_Constructive;
> >>> mti->flags = eModifierTypeFlag_AcceptsMesh;
> >>> mti->initData = testModifier_initData; // method to be called
> >>> when created
> >>> mti->copyData = testModifier_copyData; // method to be called
> >>> when copied
> >>> mti->applyModifier = testModifier_applyModifier; // method to
> >>> be called when applied
> >>> mti->applyModifierEM = testModifier_applyModifierEM; //
> method
> >>> to be called when applied
> >>> /** test modifier **/
> >>> static void testModifier_initData(ModifierData *md)
> >>> {
> >>> }
> >>>
> >>> static void testModifier_copyData(ModifierData *md, ModifierData
> *target)
> >>> {
> >>> }
> >>> static DerivedMesh *testModifier_applyModifier(ModifierData *md,
> >>> Object *ob,
> >>> DerivedMesh *dm,
> >>> int useRenderParams,
> >>> int isFinalCalc)
> >>> {
> >>> return dm;
> >>> }
> >>> static DerivedMesh *testModifier_applyModifierEM(ModifierData *md,
> >>> Object *ob,
> >>> EditMesh *editData,
> >>> DerivedMesh *derivedData)
> >>> {
> >>> return testModifier_applyModifier(md, ob, derivedData, 0, 1);
> >>> }
> >>>
> >>> 5. add user interface panel.
> >>> properties_data_modifier.py
> >>> class DATA_PT_modifiers add method [NAME]
> >>>
> >>> 6. implement modifier.
> >>>
> >>>
> >>>
> >>>
> >>> On 10/08/2010 12:30 PM, Tobias Oelgarte wrote:
> >>>
> >>>
> >>>> Hello,
> >>>>
> >>>> Im currently looking into the sources of blender and try to understand
> >>>> how the modifiers are working. Writing a modifier seams to be simple,
> >>>> but on the other side there are many other files that are keeping
> lists
> >>>> of them (to know which are available). This is somehow like finding
> all
> >>>> needles in a haystack.
> >>>>
> >>>> Is there a documentation on modifiers, that lists all the files that
> >>>> need to be changed if you write/add your own modifier? Need this files
> >>>> to be changed, or will they be updated automatically? (guess not)
> >>>>
> >>>> Somehow i miss some document that points out how i can write my own
> >>>> modifier from scratch (including gui etc.). At least a very simple
> >>>> example would be nice.
> >>>>
> >>>> Currently i developed code to write a so called RestoreVolume-Modifer,
> >>>> that ensures that a closed mesh keeps/restores it's original volume
> >>>> after deformations (due to other modifiers). Simplest example would be
> a
> >>>> muscle that contracts and will grow on the sides (controllable by
> vertex
> >>>> group), because of the loss of volume in length.
> >>>>
> >>>> Any suggestions or hints?
> >>>>
> >>>> Best wishes Tobias Oelgarte
> >>>> _______________________________________________
> >>>> Bf-committers mailing list
> >>>> Bf-committers at blender.org
> >>>> http://lists.blender.org/mailman/listinfo/bf-committers
> >>>>
> >>>>
> >>>>
> >>>>
> >>>
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> >
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