Cycles: add light falloff node, with quadratic/linear/constant falloff and a

smoothing factor to reduce high values near the light.
http://wiki.blender.org/index.php/Doc:2.6/Manual/Render/Cycles/Nodes/More#Light_Falloff

Note that this was already possible to do manually with the Ray Length, but
this adds a convenient node for it. This commit also makes the mapping node
min/max option work, fixing #31348.

1 files changed, 68 insertions, 0 deletions

diff --git a/source/blender/nodes/shader/nodes/node_shader_light_falloff.c b/source/blender/nodes/shader/nodes/node_shader_light_falloff.c
new file mode 100644
index 00000000000..8ee0f0adef6
--- /dev/null
+++ b/source/blender/nodes/shader/nodes/node_shader_light_falloff.c
@@ -0,0 +1,68 @@
+/*
+ * ***** 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) 2005 Blender Foundation.
+ * All rights reserved.
+ *
+ * The Original Code is: all of this file.
+ *
+ * Contributor(s): none yet.
+ *
+ * ***** END GPL LICENSE BLOCK *****
+ */
+
+#include "../node_shader_util.h"
+
+/* **************** INPUT ********************* */
+
+static bNodeSocketTemplate sh_node_light_falloff_in[]= {
+	{	SOCK_FLOAT, 0, "Strength",			100.0f, 0.0f, 0.0f, 0.0f, 0.0f, 1.0f},
+	{	SOCK_FLOAT, 0, "Smooth",			0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 1.0f},
+	{	-1, 0, ""	}
+};
+
+/* **************** OUTPUT ******************** */
+
+static bNodeSocketTemplate sh_node_light_falloff_out[]= {
+	{	SOCK_FLOAT, 0, "Quadratic",			0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 1.0f},
+	{	SOCK_FLOAT, 0, "Linear",			0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 1.0f},
+	{	SOCK_FLOAT, 0, "Constant",			0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 1.0f},
+	{	-1, 0, ""	}
+};
+
+static int node_shader_gpu_light_falloff(GPUMaterial *mat, bNode *UNUSED(node), GPUNodeStack *in, GPUNodeStack *out)
+{
+	return GPU_stack_link(mat, "node_light_falloff", in, out);
+}
+
+/* node type definition */
+void register_node_type_sh_light_falloff(bNodeTreeType *ttype)
+{
+	static bNodeType ntype;
+
+	node_type_base(ttype, &ntype, SH_NODE_LIGHT_FALLOFF, "Light Falloff", NODE_CLASS_OP_COLOR, 0);
+	node_type_compatibility(&ntype, NODE_NEW_SHADING);
+	node_type_socket_templates(&ntype, sh_node_light_falloff_in, sh_node_light_falloff_out);
+	node_type_size(&ntype, 150, 60, 200);
+	node_type_init(&ntype, NULL);
+	node_type_storage(&ntype, "", NULL, NULL);
+	node_type_exec(&ntype, NULL);
+	node_type_gpu(&ntype, node_shader_gpu_light_falloff);
+
+	nodeRegisterType(ttype, &ntype);
+}
+