From 20a4cdfd700d3722fdcaa3b3952ccea1b0e6ee47 Mon Sep 17 00:00:00 2001
From: Charlie Jolly <charlie>
Date: Mon, 17 Feb 2020 15:15:46 +0000
Subject: Cycles: Vector Rotate Node using Axis and Angle method

This node provides the ability to rotate a vector around a `center` point using either `Axis Angle` , `Single Axis` or `Euler` methods.

Reviewed By: #cycles, brecht

Differential Revision: https://developer.blender.org/D3789
---
 .../cycles/kernel/shaders/node_vector_rotate.osl   | 70 ++++++++++++++++++++++
 1 file changed, 70 insertions(+)
 create mode 100644 intern/cycles/kernel/shaders/node_vector_rotate.osl

(limited to 'intern/cycles/kernel/shaders/node_vector_rotate.osl')

diff --git a/intern/cycles/kernel/shaders/node_vector_rotate.osl b/intern/cycles/kernel/shaders/node_vector_rotate.osl
new file mode 100644
index 00000000000..a049ee92dbc
--- /dev/null
+++ b/intern/cycles/kernel/shaders/node_vector_rotate.osl
@@ -0,0 +1,70 @@
+/*
+ * Copyright 2011-2020 Blender Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "stdcycles.h"
+#include "node_math.h"
+
+shader node_vector_rotate(string type = "axis",
+                          vector VectorIn = vector(0.0, 0.0, 0.0),
+                          point Center = point(0.0, 0.0, 0.0),
+                          point Rotation = point(0.0, 0.0, 0.0),
+                          vector Axis = vector(0.0, 0.0, 1.0),
+                          float Angle = 0.0,
+                          output vector VectorOut = vector(0.0, 0.0, 0.0))
+{
+  if (type == "euler_xyz") {
+    VectorOut = transform(euler_to_mat(Rotation), VectorIn - Center) + Center;
+  }
+  else if (type == "euler_xzy") {
+    VectorOut = transform(euler_to_mat(point(-Rotation[0], -Rotation[2], -Rotation[1])),
+                          VectorIn - Center) +
+                Center;
+  }
+  else if (type == "euler_yxz") {
+    VectorOut = transform(euler_to_mat(point(-Rotation[1], -Rotation[0], -Rotation[2])),
+                          VectorIn - Center) +
+                Center;
+  }
+  else if (type == "euler_yzx") {
+    VectorOut = transform(euler_to_mat(point(Rotation[1], Rotation[2], Rotation[0])),
+                          VectorIn - Center) +
+                Center;
+  }
+  else if (type == "euler_zxy") {
+    VectorOut = transform(euler_to_mat(point(Rotation[2], Rotation[0], Rotation[1])),
+                          VectorIn - Center) +
+                Center;
+  }
+  else if (type == "euler_zyx") {
+    VectorOut = transform(euler_to_mat(point(-Rotation[2], -Rotation[1], -Rotation[0])),
+                          VectorIn - Center) +
+                Center;
+  }
+  else if (type == "x_axis") {
+    VectorOut = rotate(VectorIn - Center, Angle, point(0.0), vector(1.0, 0.0, 0.0)) + Center;
+  }
+  else if (type == "y_axis") {
+    VectorOut = rotate(VectorIn - Center, Angle, point(0.0), vector(0.0, 1.0, 0.0)) + Center;
+  }
+  else if (type == "z_axis") {
+    VectorOut = rotate(VectorIn - Center, Angle, point(0.0), vector(0.0, 0.0, 1.0)) + Center;
+  }
+  else {  // axis
+    VectorOut = (length(Axis) != 0.0) ?
+                    rotate(VectorIn - Center, Angle, point(0.0), Axis) + Center :
+                    VectorIn;
+  }
+}
-- 
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