From ff7c37927a7eac929e1518915dbeac259f63398f Mon Sep 17 00:00:00 2001
From: clayjohn <claynjohn@gmail.com>
Date: Sun, 18 Nov 2018 21:13:09 -0800
Subject: added pointMesh primitive

---
 doc/classes/PointMesh.xml            | 17 +++++++++++++++++
 editor/icons/icon_point_mesh.svg     |  7 +++++++
 scene/register_scene_types.cpp       |  1 +
 scene/resources/primitive_meshes.cpp | 16 ++++++++++++++++
 scene/resources/primitive_meshes.h   | 15 +++++++++++++++
 5 files changed, 56 insertions(+)
 create mode 100644 doc/classes/PointMesh.xml
 create mode 100644 editor/icons/icon_point_mesh.svg

diff --git a/doc/classes/PointMesh.xml b/doc/classes/PointMesh.xml
new file mode 100644
index 0000000000..dc7dd065cf
--- /dev/null
+++ b/doc/classes/PointMesh.xml
@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="UTF-8" ?>
+<class name="PointMesh" inherits="PrimitiveMesh" category="Core" version="3.2">
+	<brief_description>
+		Mesh with a single Point primitive.
+	</brief_description>
+	<description>
+		The PointMesh is made from a single point. Instead of relying on triangles, points are rendered as a single rectangle on the screen with a constant size. They are intended to be used with Particle systems, but can be used as a cheap way to render constant size billboarded sprites (for example in a point cloud).
+		PointMeshes, must be used with a material that has a point size. Point size can be accessed in a shader with [code]POINT_SIZE[/code], or in a [SpatialMaterial] by setting [member SpatialMaterial.flags_use_point_size] and the variable [member SpatialMaterial.params_point_size].
+		When using PointMeshes, properties that normally alter vertices will be ignored, including billboard mode, grow, and cull face.
+	</description>
+	<tutorials>
+	</tutorials>
+	<methods>
+	</methods>
+	<constants>
+	</constants>
+</class>
diff --git a/editor/icons/icon_point_mesh.svg b/editor/icons/icon_point_mesh.svg
new file mode 100644
index 0000000000..8da7759daf
--- /dev/null
+++ b/editor/icons/icon_point_mesh.svg
@@ -0,0 +1,7 @@
+<svg width="16" height="16" xmlns="http://www.w3.org/2000/svg">
+<g fill="#ffd684" stroke="#000" stroke-dasharray="null" stroke-linecap="null" stroke-linejoin="null" stroke-opacity="0" stroke-width="0">
+<ellipse cx="3.7237" cy="3.0268" rx="2.0114" ry="1.9956"/>
+<ellipse cx="11.717" cy="6.1734" rx="2.0114" ry="1.9956"/>
+<ellipse cx="6.5219" cy="12.477" rx="2.0114" ry="1.9956"/>
+</g>
+</svg>
diff --git a/scene/register_scene_types.cpp b/scene/register_scene_types.cpp
index 2533d91156..245fe3856a 100644
--- a/scene/register_scene_types.cpp
+++ b/scene/register_scene_types.cpp
@@ -607,6 +607,7 @@ void register_scene_types() {
 	ClassDB::register_class<PrismMesh>();
 	ClassDB::register_class<QuadMesh>();
 	ClassDB::register_class<SphereMesh>();
+	ClassDB::register_class<PointMesh>();
 	ClassDB::register_virtual_class<Material>();
 	ClassDB::register_class<SpatialMaterial>();
 	SceneTree::add_idle_callback(SpatialMaterial::flush_changes);
diff --git a/scene/resources/primitive_meshes.cpp b/scene/resources/primitive_meshes.cpp
index 74a493d3b5..24fdaafbe1 100644
--- a/scene/resources/primitive_meshes.cpp
+++ b/scene/resources/primitive_meshes.cpp
@@ -1572,3 +1572,19 @@ SphereMesh::SphereMesh() {
 	rings = 32;
 	is_hemisphere = false;
 }
+
+/**
+  PointMesh
+*/
+
+void PointMesh::_create_mesh_array(Array &p_arr) const {
+	PoolVector<Vector3> faces;
+	faces.resize(1);
+	faces.set(0, Vector3(0.0, 0.0, 0.0));
+
+	p_arr[VS::ARRAY_VERTEX] = faces;
+}
+
+PointMesh::PointMesh() {
+	primitive_type = PRIMITIVE_POINTS;
+}
diff --git a/scene/resources/primitive_meshes.h b/scene/resources/primitive_meshes.h
index 312899c028..fad49f9642 100644
--- a/scene/resources/primitive_meshes.h
+++ b/scene/resources/primitive_meshes.h
@@ -322,4 +322,19 @@ public:
 	SphereMesh();
 };
 
+/**
+	A single point for use in particle systems
+*/
+
+class PointMesh : public PrimitiveMesh {
+
+	GDCLASS(PointMesh, PrimitiveMesh)
+
+protected:
+	virtual void _create_mesh_array(Array &p_arr) const;
+
+public:
+	PointMesh();
+};
+
 #endif
-- 
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