From b8bcd21a19058bd8e3c48af9a872c5767738b552 Mon Sep 17 00:00:00 2001
From: Edwin Jakobs <edwin@rndr.studio>
Date: Wed, 5 Mar 2025 19:11:35 +0100
Subject: [PATCH] [orx-shade-styles] Add `visualizeNormals` shade style.

---
 orx-shade-styles/build.gradle.kts             |  1 +
 .../kotlin/spatial/VisualizeNormals.kt        | 11 ++++++
 .../kotlin/spatial/DemoVisualizeNormals01.kt  | 34 +++++++++++++++++++
 3 files changed, 46 insertions(+)
 create mode 100644 orx-shade-styles/src/commonMain/kotlin/spatial/VisualizeNormals.kt
 create mode 100644 orx-shade-styles/src/jvmDemo/kotlin/spatial/DemoVisualizeNormals01.kt

diff --git a/orx-shade-styles/build.gradle.kts b/orx-shade-styles/build.gradle.kts
index 7dcbea87..2065386a 100644
--- a/orx-shade-styles/build.gradle.kts
+++ b/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"))
             }
         }
     }
diff --git a/orx-shade-styles/src/commonMain/kotlin/spatial/VisualizeNormals.kt b/orx-shade-styles/src/commonMain/kotlin/spatial/VisualizeNormals.kt
new file mode 100644
index 00000000..1ad0672a
--- /dev/null
+++ b/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()
+    }
+}
\ No newline at end of file
diff --git a/orx-shade-styles/src/jvmDemo/kotlin/spatial/DemoVisualizeNormals01.kt b/orx-shade-styles/src/jvmDemo/kotlin/spatial/DemoVisualizeNormals01.kt
new file mode 100644
index 00000000..30748fb1
--- /dev/null
+++ b/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)
+
+            }
+
+        }
+    }
+}
\ No newline at end of file