From 9f895fbb9708eaa1d70abcd3091d44f262380a8a Mon Sep 17 00:00:00 2001
From: Hans Goudey <h.goudey@me.com>
Date: Mon, 18 Oct 2021 12:31:01 -0500
Subject: [PATCH] Geometry Nodes: Optimize curve builtin attribute exists check

Calculating the number of points is overkill here, if there are many splines.
The `exists` check just needs to know if there are any points at all.
---
 .../intern/geometry_component_curve.cc        | 24 ++++++++++++++++++-
 1 file changed, 23 insertions(+), 1 deletion(-)

diff --git a/source/blender/blenkernel/intern/geometry_component_curve.cc b/source/blender/blenkernel/intern/geometry_component_curve.cc
index 73c628d3f0f..8923521d699 100644
--- a/source/blender/blenkernel/intern/geometry_component_curve.cc
+++ b/source/blender/blenkernel/intern/geometry_component_curve.cc
@@ -1055,7 +1055,29 @@ template<typename T> class BuiltinPointAttributeProvider : public BuiltinAttribu
 
   bool exists(const GeometryComponent &component) const final
   {
-    return component.attribute_domain_size(ATTR_DOMAIN_POINT) != 0;
+    const CurveEval *curve = get_curve_from_component_for_read(component);
+    if (curve == nullptr) {
+      return false;
+    }
+
+    Span<SplinePtr> splines = curve->splines();
+    if (splines.size() == 0) {
+      return false;
+    }
+
+    bool has_point = false;
+    for (const SplinePtr &spline : curve->splines()) {
+      if (spline->size() != 0) {
+        has_point = true;
+        break;
+      }
+    }
+
+    if (!has_point) {
+      return false;
+    }
+
+    return true;
   }
 };