Blender Internal: Add "Lamp Data" shader node that allows shaders to acquire information such as light vector from specified Lamp.

For now this provides the following outputs:

- Color
- Light Vector
- Distance
- Shadow
- Visibility Factor

Note: Color output is multiplied by the lamp energy.  Multiplication of
color*max(dot(light_vector,normal_vector),0)*shadow*visibility_factor
produces the exact same result as the Lambert shader.

Many thanks to Brecht for code review and discussion!

1 files changed, 8 insertions, 0 deletions

diff --git a/source/blender/editors/space_node/drawnode.c b/source/blender/editors/space_node/drawnode.c
index b33c3d6c228..61e7fd89866 100644
--- a/source/blender/editors/space_node/drawnode.c
+++ b/source/blender/editors/space_node/drawnode.c
@@ -753,6 +753,11 @@ static void node_shader_buts_geometry(uiLayout *layout, bContext *C, PointerRNA
 	}
 }
 
+static void node_shader_buts_lamp(uiLayout *layout, bContext *UNUSED(C), PointerRNA *ptr)
+{
+	uiItemR(layout, ptr, "lamp_object", 0, IFACE_("Lamp Object"), ICON_NONE);
+}
+
 static void node_shader_buts_attribute(uiLayout *layout, bContext *UNUSED(C), PointerRNA *ptr)
 {
 	uiItemR(layout, ptr, "attribute_name", 0, IFACE_("Name"), ICON_NONE);
@@ -1002,6 +1007,9 @@ static void node_shader_set_butfunc(bNodeType *ntype)
 		case SH_NODE_GEOMETRY:
 			ntype->draw_buttons = node_shader_buts_geometry;
 			break;
+		case SH_NODE_LAMP:
+			ntype->draw_buttons = node_shader_buts_lamp;
+			break;
 		case SH_NODE_ATTRIBUTE:
 			ntype->draw_buttons = node_shader_buts_attribute;
 			break;