From 2fc7d04804fc9411647466d6765e2716e56a9cc8 Mon Sep 17 00:00:00 2001
From: Campbell Barton <ideasman42@gmail.com>
Date: Mon, 31 Mar 2014 14:56:43 +1100
Subject: Add Simple randomize vertex tool

D432 from Walid Shouman with normal & uniform options added.
---
 source/blender/editors/object/object_random.c | 149 ++++++++++++++++++++++++++
 1 file changed, 149 insertions(+)
 create mode 100644 source/blender/editors/object/object_random.c

(limited to 'source/blender/editors/object/object_random.c')

diff --git a/source/blender/editors/object/object_random.c b/source/blender/editors/object/object_random.c
new file mode 100644
index 00000000000..34ac169bbfc
--- /dev/null
+++ b/source/blender/editors/object/object_random.c
@@ -0,0 +1,149 @@
+/*
+ * ***** BEGIN GPL LICENSE BLOCK *****
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * The Original Code is Copyright (C) 2014 by Blender Foundation
+ * All rights reserved.
+ *
+ * ***** END GPL LICENSE BLOCK *****
+ */
+
+/** \file blender/editors/object/object_random.c
+ *  \ingroup edobj
+ */
+
+#include "DNA_object_types.h"
+
+#include "BLI_math.h"
+#include "BLI_rand.h"
+
+
+#include "BKE_context.h"
+
+#include "RNA_access.h"
+#include "RNA_define.h"
+
+#include "WM_api.h"
+#include "WM_types.h"
+
+#include "ED_transverts.h"
+
+#include "object_intern.h"
+
+
+/**
+ *  Generic randomize vertices function
+ */
+
+static bool object_rand_transverts(
+        TransVertStore *tvs,
+        const float offset, const float uniform, const float normal_factor,
+        const unsigned int seed)
+{
+	bool use_normal = (normal_factor != 0.0f);
+	struct RNG *rng;
+	TransVert *tv;
+	int a;
+
+	if (!tvs || !(tvs->transverts)) {
+		return false;
+	}
+
+	rng = BLI_rng_new(seed);
+
+	tv = tvs->transverts;
+	for (a = 0; a < tvs->transverts_tot; a++, tv++) {
+		const float t = max_ff(0.0f, uniform + ((1.0f - uniform) * BLI_rng_get_float(rng)));
+		float vec[3];
+		BLI_rng_get_float_unit_v3(rng, vec);
+
+		if (use_normal && (tv->flag & TX_VERT_USE_NORMAL)) {
+			float no[3];
+
+			/* avoid >90d rotation to align with normal */
+			if (dot_v3v3(vec, tv->normal) < 0.0f) {
+				negate_v3_v3(no, tv->normal);
+			}
+			else {
+				copy_v3_v3(no, tv->normal);
+			}
+
+			interp_v3_v3v3_slerp_safe(vec, vec, no, normal_factor);
+		}
+
+		madd_v3_v3fl(tv->loc, vec, offset * t);
+	}
+
+	BLI_rng_free(rng);
+
+	return true;
+}
+
+static int object_rand_verts_exec(bContext *C, wmOperator *op)
+{
+	const float offset = RNA_float_get(op->ptr, "offset");
+	const float uniform = RNA_float_get(op->ptr, "uniform");
+	const float normal_factor = RNA_float_get(op->ptr, "normal");
+	const unsigned int seed = RNA_int_get(op->ptr, "seed");
+
+	TransVertStore tvs = {NULL};
+	Object *obedit = CTX_data_edit_object(C);
+
+	if (obedit) {
+		int mode = TM_ALL_JOINTS;
+
+		if (normal_factor != 0.0f) {
+			mode |= TX_VERT_USE_NORMAL;
+		}
+
+		ED_transverts_create_from_obedit(&tvs, obedit, mode);
+		if (tvs.transverts_tot == 0)
+			return OPERATOR_CANCELLED;
+
+		object_rand_transverts(&tvs, offset, uniform, normal_factor, seed);
+
+		ED_transverts_update_obedit(&tvs, obedit);
+		ED_transverts_free(&tvs);
+	}
+
+	WM_event_add_notifier(C, NC_OBJECT | ND_DRAW, obedit);
+
+	return OPERATOR_FINISHED;
+}
+
+void OBJECT_OT_vertex_random(struct wmOperatorType *ot)
+{
+	/* identifiers */
+	ot->name = "Randomize";
+	ot->description = "Randomize vertices";
+	ot->idname = "OBJECT_OT_vertex_random";
+
+	/* api callbacks */
+	ot->exec = object_rand_verts_exec;
+	ot->poll = ED_transverts_poll;
+
+	/* flags */
+	ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;
+
+	/* props */
+	RNA_def_float(ot->srna, "offset",  0.1f, -FLT_MAX, FLT_MAX, "Ammount",
+	              "Distance to offset", -10.0f, 10.0f);
+	RNA_def_float(ot->srna, "uniform",  0.0f, 0.0f, 1.0f, "Uniform",
+	              "Increase for uniform offset distance", 0.0f, 1.0f);
+	RNA_def_float(ot->srna, "normal",  0.0f, 0.0f, 1.0f, "normal",
+	              "Align offset direction to normals", 0.0f, 1.0f);
+	RNA_def_int(ot->srna, "seed", 0, 0, 10000, "Random Seed", "Seed for the random number generator", 0, 50);
+}
-- 
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