[orx-shade-styles] Add visualizeNormals shade style.

orx-shade-styles/build.gradle.kts

@@ -26,6 +26,7 @@ kotlin {
                 implementation(project(":orx-shapes"))
                 implementation(project(":orx-image-fit"))
                 implementation(project(":orx-camera"))
+                implementation(project(":orx-obj-loader"))
             }
         }
     }

orx-shade-styles/src/commonMain/kotlin/spatial/VisualizeNormals.kt

@@ -0,0 +1,11 @@
+package org.openrndr.extra.shadestyles.spatial
+
+import org.openrndr.draw.shadeStyle
+
+val visualizeNormals by lazy {
+    shadeStyle {
+        fragmentTransform = """
+        x_fill = vec4(normalize(v_viewNormal)*0.5+0.5, 1.0) ;
+    """.trimIndent()
+    }
+}

orx-shade-styles/src/jvmDemo/kotlin/spatial/DemoVisualizeNormals01.kt

@@ -0,0 +1,34 @@
+package spatial
+
+import org.openrndr.WindowMultisample
+import org.openrndr.application
+import org.openrndr.draw.DrawPrimitive
+import org.openrndr.extra.camera.Orbital
+import org.openrndr.extra.objloader.loadOBJasVertexBuffer
+import org.openrndr.extra.shadestyles.spatial.visualizeNormals
+import org.openrndr.math.Vector3
+
+fun main() {
+    application {
+        configure {
+            width = 720
+            height = 720
+            multisample = WindowMultisample.SampleCount(8)
+        }
+
+        program {
+            val obj = loadOBJasVertexBuffer("demo-data/obj-models/suzanne/Suzanne.obj")
+
+            extend(Orbital()) {
+                eye = Vector3(0.0, 0.0, 2.0)
+            }
+            extend {
+
+                drawer.shadeStyle = visualizeNormals
+                drawer.vertexBuffer(obj, DrawPrimitive.TRIANGLES)
+
+            }
+
+        }
+    }
+}