Add screenshot generation

orx-mesh-generators/src/demo/kotlin/DemoComplex01.kt

@@ -1,17 +1,18 @@
 import org.openrndr.application
 import org.openrndr.draw.DrawPrimitive
 import org.openrndr.draw.shadeStyle
+import org.openrndr.extensions.SingleScreenshot
 import org.openrndr.extras.camera.Orbital
 import org.openrndr.extras.meshgenerators.box
 import org.openrndr.extras.meshgenerators.group
 import org.openrndr.extras.meshgenerators.meshGenerator
 import org.openrndr.extras.meshgenerators.sphere
+import org.openrndr.math.Vector3
 import org.openrndr.math.transforms.transform
 
 fun main() {
     application {
         program {
-            extend(Orbital())
             val m = meshGenerator {
                 sphere(32, 32, 1.0)
                 group {
@@ -21,6 +22,16 @@ fun main() {
                     })
                 }
             }
+            if (System.getProperty("takeScreenshot") == "true") {
+                extend(SingleScreenshot()) {
+                    this.outputFile = System.getProperty("screenshotPath")
+                }
+            }
+            extend(Orbital()) {
+                this.eye = Vector3(0.0, 3.0, 7.0)
+                this.lookAt = Vector3(0.0, 2.0, 0.0)
+            }
+
             extend {
                 drawer.shadeStyle = shadeStyle {
                     fragmentTransform = """