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2018-06-28T19:37:34Z

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wiki>Ilent2: /* Modifying the files */ Updated properties_data_modifier.py path and surrounding text.

2014-01-25T10:57:34Z

‎Modifying the files: Updated properties_data_modifier.py path and surrounding text.

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= Creating a custom modifier =

Here is a tutorial to make a custom modifier that does nothing but printf its existence! I figured this out by copying the SoftBody modifier and scouring the source code for all references to it. I called my modifier Enja, so just replace any instance of Enja in this post with your own chosen name.

== Preparing the files ==

First we want to create our main modifier code file.

Let's create <code>blender/modifiers/intern/MOD_enja.c</code> (all paths start in the source folder):

<source lang="bash">cp blender/modifiers/intern/MOD_softbody.c blender/modifiers/intern/MOD_enja.c</source>

In here you will add functionality and of course replace all instances of <code>SoftBody</code> with <code>Enja</code>. Have a look at [[User:Enjalot/Creating_a_custom_modifier/MOD_enja.c|my modified MOD_enja.c]]

== Modifying the files ==

The rest of the instructions are just modifying files (if you are confused about where things go, just look at Softbody!

At line 184 of <code>blender/modifiers/intern/MOD_util.c</code> add
<source lang="cpp">
INIT_TYPE(Enja);
</source>

At line 70 of <code>blender/modifiers/MOD_modifiertypes.h</code> add
<source lang="cpp"> extern ModifierTypeInfo modifierType_Enja;</source>

At line 564 of: <code>blender/makesrna/RNA_access.h</code> add
<source lang="cpp">
extern StructRNA RNA_EnjaModifier;
</source>

At line 303 of: <code>blender/blenkernel/BKE_modifier.h</code> add
<source lang="cpp">
int modifiers_isEnjaEnabled(struct Object *ob);
</source>

We need to edit <code>blender/makesdna/DNA_modifier_types.h</code> in a couple places:
* on line 69, just after ''eModifierType_Screw'' and before ''NUM_MODIFIER_TYPES'' add
<source lang="cpp">
eModifierType_Enja
</source>

*on line 441, after the ''SoftbodyModifierData'' struct, add
<source lang="cpp">
typedef struct EnjaModifierData {
ModifierData modifier;
} EnjaModifierData;
</source>

Finally on line 85 of <code>blender/makesrna/intern/rna_modifier.c</code> (before the {0,NULL,0,NULL,NULL} entry:
<source lang="cpp">
{eModifierType_Enja, "ENJA", ICON_MOD_SOFT, "Enja", ""}
</source>

Note that I didn't change the icon to ICON_MOD_ENJA because I didn't take the time to figure out making a new icon yet.

To declare the User Interface for our new modifier, we need to edit one last file <code>../release/scripts/startup/bl_ui/properties_data_modifier.py</code> around line 624
<source lang="python">
def ENJA(self, layout, ob, md, wide_ui):
layout.label(text="Coming soon.")
</source>

This should build and give you a modifier under the Simulate header that does nothing but print out a message when you add it.

__TOC__

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