[orx-hash-grid] Add HashGrid3D

orx-hash-grid/src/jvmDemo/kotlin/DemoFilter01.kt

@@ -16,7 +16,7 @@ fun main() {
             }
             val filteredPoints = points.filter(20.0)
             extend {
-                drawer.circles(filteredPoints, 4.0)
+                drawer.circles(filteredPoints, 10.0)
             }
         }
     }

orx-hash-grid/src/jvmDemo/kotlin/DemoFilter3D01.kt

@@ -0,0 +1,42 @@
+import org.openrndr.WindowMultisample
+import org.openrndr.application
+import org.openrndr.draw.DrawPrimitive
+import org.openrndr.draw.isolated
+import org.openrndr.draw.shadeStyle
+import org.openrndr.extra.camera.Orbital
+import org.openrndr.extra.hashgrid.filter
+import org.openrndr.extra.meshgenerators.sphereMesh
+import org.openrndr.extra.noise.uniformRing
+import org.openrndr.math.Vector3
+import kotlin.random.Random
+
+fun main() = application {
+    configure {
+        width = 720
+        height = 720
+        multisample = WindowMultisample.SampleCount(4)
+    }
+    program {
+        val r = Random(0)
+        val points = (0 until 10000).map {
+            Vector3.uniformRing(0.0, 10.0, r)
+        }
+        val sphere = sphereMesh(radius = 0.25)
+        val filteredPoints = points.filter(0.5)
+
+        extend(Orbital()) {
+            eye = Vector3(0.0, 0.0, 15.0)
+        }
+        extend {
+            drawer.shadeStyle = shadeStyle {
+                fragmentTransform = """x_fill.rgb *= abs(v_viewNormal.z);"""
+            }
+            for (point in filteredPoints) {
+                drawer.isolated {
+                    drawer.translate(point)
+                    drawer.vertexBuffer(sphere, DrawPrimitive.TRIANGLES)
+                }
+            }
+        }
+    }
+}