Geometry Nodes: Curve Primitive Line

This node creates a poly spline line in one of 2 modes:
 - Line between two points
 - Start Point, Direction, and Length

Both modes create splines with only start and endpoints.
A resample node can be used afterward to increase the point count.

Differential Revision: https://developer.blender.org/D11769

release/scripts/startup/nodeitems_builtins.py

@@ -510,6 +510,7 @@ geometry_node_categories = [
         NodeItem("GeometryNodeCurveReverse"),
     ]),
     GeometryNodeCategory("GEO_PRIMITIVES_CURVE", "Curve Primitives", items=[
+        NodeItem("GeometryNodeCurvePrimitiveLine"),
         NodeItem("GeometryNodeCurvePrimitiveCircle"),
         NodeItem("GeometryNodeCurveStar"),
         NodeItem("GeometryNodeCurveSpiral"),

source/blender/blenkernel/BKE_node.h

@@ -1445,6 +1445,7 @@ int ntreeTexExecTree(struct bNodeTree *ntree,
 #define GEO_NODE_CURVE_PRIMITIVE_BEZIER_SEGMENT 1065
 #define GEO_NODE_CURVE_PRIMITIVE_CIRCLE 1066
 #define GEO_NODE_VIEWER 1067
+#define GEO_NODE_CURVE_PRIMITIVE_LINE 1068
 
 /** \} */
 

source/blender/blenkernel/intern/node.cc

@@ -5056,6 +5056,7 @@ static void registerGeometryNodes()
   register_node_type_geo_curve_length();
   register_node_type_geo_curve_primitive_bezier_segment();
   register_node_type_geo_curve_primitive_circle();
+  register_node_type_geo_curve_primitive_line();
   register_node_type_geo_curve_primitive_quadratic_bezier();
   register_node_type_geo_curve_primitive_spiral();
   register_node_type_geo_curve_primitive_star();

source/blender/makesdna/DNA_node_types.h

@@ -1358,6 +1358,11 @@ typedef struct NodeSwitch {
   uint8_t input_type;
 } NodeSwitch;
 
+typedef struct NodeGeometryCurvePrimitiveLine {
+  /* GeometryNodeCurvePrimitiveLineMode. */
+  uint8_t mode;
+} NodeGeometryCurvePrimitiveLine;
+
 typedef struct NodeGeometryCurvePrimitiveBezierSegment {
   /* GeometryNodeCurvePrimitiveBezierSegmentMode. */
   uint8_t mode;
@@ -1913,6 +1918,11 @@ typedef enum GeometryNodeMeshLineCountMode {
   GEO_NODE_MESH_LINE_COUNT_RESOLUTION = 1,
 } GeometryNodeMeshLineCountMode;
 
+typedef enum GeometryNodeCurvePrimitiveLineMode {
+  GEO_NODE_CURVE_PRIMITIVE_LINE_MODE_POINTS = 0,
+  GEO_NODE_CURVE_PRIMITIVE_LINE_MODE_DIRECTION = 1
+} GeometryNodeCurvePrimitiveLineMode;
+
 typedef enum GeometryNodeCurvePrimitiveBezierSegmentMode {
   GEO_NODE_CURVE_PRIMITIVE_BEZIER_SEGMENT_POSITION = 0,
   GEO_NODE_CURVE_PRIMITIVE_BEZIER_SEGMENT_OFFSET = 1,

source/blender/makesrna/intern/rna_nodetree.c

@@ -9488,6 +9488,32 @@ static void def_geo_curve_primitive_circle(StructRNA *srna)
   RNA_def_property_update(prop, NC_NODE | NA_EDITED, "rna_Node_socket_update");
 }
 
+static void def_geo_curve_primitive_line(StructRNA *srna)
+{
+  static const EnumPropertyItem mode_items[] = {
+      {GEO_NODE_CURVE_PRIMITIVE_LINE_MODE_POINTS,
+       "POINTS",
+       ICON_NONE,
+       "Points",
+       "Define the start and end points of the line"},
+      {GEO_NODE_CURVE_PRIMITIVE_LINE_MODE_DIRECTION,
+       "DIRECTION",
+       ICON_NONE,
+       "Direction",
+       "Define a line with a start point, direction and length"},
+      {0, NULL, 0, NULL, NULL},
+  };
+
+  PropertyRNA *prop;
+
+  RNA_def_struct_sdna_from(srna, "NodeGeometryCurvePrimitiveLine", "storage");
+
+  prop = RNA_def_property(srna, "mode", PROP_ENUM, PROP_NONE);
+  RNA_def_property_enum_items(prop, mode_items);
+  RNA_def_property_ui_text(prop, "Mode", "Method used to determine radius and placement");
+  RNA_def_property_update(prop, NC_NODE | NA_EDITED, "rna_Node_socket_update");
+}
+
 static void def_geo_point_rotate(StructRNA *srna)
 {
   static const EnumPropertyItem type_items[] = {

source/blender/nodes/CMakeLists.txt

@@ -167,6 +167,7 @@ set(SRC
   geometry/nodes/node_geo_curve_length.cc  
   geometry/nodes/node_geo_curve_primitive_bezier_segment.cc
   geometry/nodes/node_geo_curve_primitive_circle.cc
+  geometry/nodes/node_geo_curve_primitive_line.cc
   geometry/nodes/node_geo_curve_primitive_quadratic_bezier.cc
   geometry/nodes/node_geo_curve_primitive_spiral.cc
   geometry/nodes/node_geo_curve_primitive_star.cc

source/blender/nodes/NOD_geometry.h

@@ -54,6 +54,7 @@ void register_node_type_geo_convex_hull(void);
 void register_node_type_geo_curve_length(void);
 void register_node_type_geo_curve_primitive_bezier_segment(void);
 void register_node_type_geo_curve_primitive_circle(void);
+void register_node_type_geo_curve_primitive_line(void);
 void register_node_type_geo_curve_primitive_quadratic_bezier(void);
 void register_node_type_geo_curve_primitive_spiral(void);
 void register_node_type_geo_curve_primitive_star(void);

source/blender/nodes/NOD_static_types.h

@@ -294,6 +294,7 @@ DefNode(GeometryNode, GEO_NODE_CONVEX_HULL, 0, "CONVEX_HULL", ConvexHull, "Conve
 DefNode(GeometryNode, GEO_NODE_CURVE_LENGTH, 0, "CURVE_LENGTH", CurveLength, "Curve Length", "")
 DefNode(GeometryNode, GEO_NODE_CURVE_PRIMITIVE_BEZIER_SEGMENT, def_geo_curve_primitive_bezier_segment, "CURVE_PRIMITIVE_BEZIER_SEGMENT", CurvePrimitiveBezierSegment, "Bezier Segment", "")
 DefNode(GeometryNode, GEO_NODE_CURVE_PRIMITIVE_CIRCLE, def_geo_curve_primitive_circle, "CURVE_PRIMITIVE_CIRCLE", CurvePrimitiveCircle, "Circle", "")
+DefNode(GeometryNode, GEO_NODE_CURVE_PRIMITIVE_LINE, def_geo_curve_primitive_line, "CURVE_PRIMITIVE_LINE", CurvePrimitiveLine, "Curve Line", "")
 DefNode(GeometryNode, GEO_NODE_CURVE_PRIMITIVE_QUADRATIC_BEZIER, 0, "CURVE_PRIMITIVE_QUADRATIC_BEZIER", CurveQuadraticBezier, "Quadratic Bezier", "")
 DefNode(GeometryNode, GEO_NODE_CURVE_PRIMITIVE_STAR, 0, "CURVE_PRIMITIVE_STAR", CurveStar, "Star", "")
 DefNode(GeometryNode, GEO_NODE_CURVE_PRIMITIVE_SPIRAL, 0, "CURVE_PRIMITIVE_SPIRAL", CurveSpiral, "Curve Spiral", "")

source/blender/nodes/geometry/nodes/node_geo_curve_primitive_line.cc

@@ -0,0 +1,146 @@
+/*
+ * 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.
+ */
+
+#include "BKE_spline.hh"
+
+#include "UI_interface.h"
+#include "UI_resources.h"
+
+#include "node_geometry_util.hh"
+
+static bNodeSocketTemplate geo_node_curve_primitive_line_in[] = {
+    {SOCK_VECTOR, N_("Start"), 0.0f, 0.0f, 0.0f, 0.0f, -FLT_MAX, FLT_MAX, PROP_TRANSLATION},
+    {SOCK_VECTOR, N_("End"), 0.0f, 2.0f, 0.0f, 0.0f, -FLT_MAX, FLT_MAX, PROP_TRANSLATION},
+    {SOCK_VECTOR, N_("Direction"), 0.0f, 1.0f, 0.0f, 0.0f, -FLT_MAX, FLT_MAX},
+    {SOCK_FLOAT, N_("Length"), 2.0f, 0.0f, 0.0f, 0.0f, -FLT_MAX, FLT_MAX, PROP_DISTANCE},
+    {-1, ""},
+};
+
+static bNodeSocketTemplate geo_node_curve_primitive_line_out[] = {
+    {SOCK_GEOMETRY, N_("Curve")},
+    {-1, ""},
+};
+
+static void geo_node_curve_primitive_line_layout(uiLayout *layout,
+                                                 bContext *UNUSED(C),
+                                                 PointerRNA *ptr)
+{
+  uiItemR(layout, ptr, "mode", UI_ITEM_R_EXPAND, nullptr, ICON_NONE);
+}
+
+namespace blender::nodes {
+
+static void geo_node_curve_primitive_line_init(bNodeTree *UNUSED(tree), bNode *node)
+{
+  NodeGeometryCurvePrimitiveLine *data = (NodeGeometryCurvePrimitiveLine *)MEM_callocN(
+      sizeof(NodeGeometryCurvePrimitiveLine), __func__);
+
+  data->mode = GEO_NODE_CURVE_PRIMITIVE_LINE_MODE_POINTS;
+  node->storage = data;
+}
+
+static void geo_node_curve_primitive_line_update(bNodeTree *UNUSED(ntree), bNode *node)
+{
+  const NodeGeometryCurvePrimitiveLine *node_storage = (NodeGeometryCurvePrimitiveLine *)
+                                                           node->storage;
+  const GeometryNodeCurvePrimitiveLineMode mode = (const GeometryNodeCurvePrimitiveLineMode)
+                                                      node_storage->mode;
+
+  bNodeSocket *p2_socket = ((bNodeSocket *)node->inputs.first)->next;
+  bNodeSocket *direction_socket = p2_socket->next;
+  bNodeSocket *length_socket = direction_socket->next;
+
+  nodeSetSocketAvailability(p2_socket, mode == GEO_NODE_CURVE_PRIMITIVE_LINE_MODE_POINTS);
+  nodeSetSocketAvailability(direction_socket,
+                            mode == GEO_NODE_CURVE_PRIMITIVE_LINE_MODE_DIRECTION);
+  nodeSetSocketAvailability(length_socket, mode == GEO_NODE_CURVE_PRIMITIVE_LINE_MODE_DIRECTION);
+}
+
+static std::unique_ptr<CurveEval> create_point_line_curve(const float3 start, const float3 end)
+{
+  std::unique_ptr<CurveEval> curve = std::make_unique<CurveEval>();
+  std::unique_ptr<PolySpline> spline = std::make_unique<PolySpline>();
+
+  spline->resize(2);
+  MutableSpan<float3> positions = spline->positions();
+  positions[0] = start;
+  positions[1] = end;
+  spline->radii().fill(1.0f);
+  spline->tilts().fill(0.0f);
+  curve->add_spline(std::move(spline));
+  curve->attributes.reallocate(curve->splines().size());
+  return curve;
+}
+
+static std::unique_ptr<CurveEval> create_direction_line_curve(const float3 start,
+                                                              const float3 direction,
+                                                              const float length)
+{
+  std::unique_ptr<CurveEval> curve = std::make_unique<CurveEval>();
+  std::unique_ptr<PolySpline> spline = std::make_unique<PolySpline>();
+
+  spline->resize(2);
+  MutableSpan<float3> positions = spline->positions();
+  positions[0] = start;
+  positions[1] = direction.normalized() * length;
+
+  spline->radii().fill(1.0f);
+  spline->tilts().fill(0.0f);
+  curve->add_spline(std::move(spline));
+  curve->attributes.reallocate(curve->splines().size());
+  return curve;
+}
+
+static void geo_node_curve_primitive_line_exec(GeoNodeExecParams params)
+{
+
+  const NodeGeometryCurvePrimitiveLine *node_storage =
+      (NodeGeometryCurvePrimitiveLine *)params.node().storage;
+
+  GeometryNodeCurvePrimitiveLineMode mode = (GeometryNodeCurvePrimitiveLineMode)node_storage->mode;
+
+  std::unique_ptr<CurveEval> curve;
+  if (mode == GEO_NODE_CURVE_PRIMITIVE_LINE_MODE_POINTS) {
+    curve = create_point_line_curve(params.extract_input<float3>("Start"),
+                                    params.extract_input<float3>("End"));
+  }
+  else if (mode == GEO_NODE_CURVE_PRIMITIVE_LINE_MODE_DIRECTION) {
+    curve = create_direction_line_curve(params.extract_input<float3>("Start"),
+                                        params.extract_input<float3>("Direction"),
+                                        params.extract_input<float>("Length"));
+  }
+
+  params.set_output("Curve", GeometrySet::create_with_curve(curve.release()));
+}
+
+}  // namespace blender::nodes
+
+void register_node_type_geo_curve_primitive_line()
+{
+  static bNodeType ntype;
+  geo_node_type_base(&ntype, GEO_NODE_CURVE_PRIMITIVE_LINE, "Curve Line", NODE_CLASS_GEOMETRY, 0);
+  node_type_socket_templates(
+      &ntype, geo_node_curve_primitive_line_in, geo_node_curve_primitive_line_out);
+  node_type_init(&ntype, blender::nodes::geo_node_curve_primitive_line_init);
+  node_type_update(&ntype, blender::nodes::geo_node_curve_primitive_line_update);
+  node_type_storage(&ntype,
+                    "NodeGeometryCurvePrimitiveLine",
+                    node_free_standard_storage,
+                    node_copy_standard_storage);
+  ntype.geometry_node_execute = blender::nodes::geo_node_curve_primitive_line_exec;
+  ntype.draw_buttons = geo_node_curve_primitive_line_layout;
+  nodeRegisterType(&ntype);
+}