add skin color modifier

Assets/Scripts/Characters/CharacterDescriptor.cs

@@ -4,6 +4,7 @@ using UMA;
 using UMA.CharacterSystem;
 using System.Collections.Generic;
 using UnityEngine.UI;
+using static UnityEngine.Rendering.DebugUI;
 
 public class CharacterDescriptor : MonoBehaviour
 {
@@ -79,4 +80,10 @@ public class CharacterDescriptor : MonoBehaviour
         _dna["belly"].Set(value);
         _avatar.BuildCharacter();
     }
+
+    public void ChangeSkinColor(Color color)
+    {
+        _avatar.SetColor("Skin",color);
+        _avatar.UpdateColors(true);
+    }
 }

Assets/Scripts/UI/ImageColorPicker.cs

@@ -0,0 +1,40 @@
+using System;
+using UnityEngine;
+using UnityEngine.Events;
+using UnityEngine.EventSystems;
+using UnityEngine.UI;
+
+public class ImageColorPicker : MonoBehaviour, IPointerClickHandler
+{
+    public Color selectedColor;
+
+    [Serializable]
+    public class ColorEvent : UnityEvent<Color> { }
+    public ColorEvent OnColorPicked = new ColorEvent();
+
+    public void OnPointerClick(PointerEventData eventData)
+    {
+        selectedColor = GetColor(GetPointUVPosition());
+        OnColorPicked.Invoke(selectedColor);
+
+    }
+
+    private Color GetColor(Vector2 pos)
+    {
+        Texture2D texture = GetComponent<Image>().sprite.texture;
+        Color selected = texture.GetPixelBilinear(pos.x, pos.y);
+        selected.a = 1;
+        return selected;
+    }
+
+    private Vector2 GetPointUVPosition()
+    {
+        Vector3[] imageCorners = new Vector3[4];
+        gameObject.GetComponent<RectTransform>().GetWorldCorners(imageCorners);
+        float texWidth = imageCorners[2].x - imageCorners[0].x;
+        float texHeight = imageCorners[2].y - imageCorners[0].y;
+        float uvX = (Input.mousePosition.x - imageCorners[0].x) / texWidth;
+        float uvY = (Input.mousePosition.y - imageCorners[0].y) / texHeight;
+        return new Vector2(uvX, uvY);
+    }
+}

Assets/Scripts/UI/ImageColorPicker.cs.meta

@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: 2f3eb60cba57441478f606990bede4d9