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unity在模型上绘制贴图
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unity在模型上绘制贴图
前言
在我的上一篇文章【基于高度进行混合的shader】里面分享了如何利用高度图进行贴图的混合，里面使用了T4M插件来绘制控制混合的control贴图。 像T4M这样直接在mesh上对贴图进行绘制的功能对于美术的同学肯定不陌生，很多建模工具都支持直接在模型上对贴图进行绘制，如C4D的bodypaint工具、allegorithmic公司推出的Substance Painter都支持直接在模型上进行绘制。 这里分享一下如何在UNITY里实现这个在模型上绘画的功能。 在unity中新建一个工程，创建所需要的几个文件夹 一个用来测试的mesh 用来测试的几张地表贴图 一些用来做笔刷的PNG图（直接从T4M里面扒过来的） 新建一个scene，把测试用的模型拖到场景中，给模型一个新的Material，并使用附件中的文件名为mya_T4M_4tex_blend_diffuse 的这个shader，并参考下图进行配置： 创建一个meshPainter.cs文件，挂在这个模型上。 using UnityEngine; using System.Collections; [ExecuteInEditMode] [RequireComponent(typeof(MeshCollider))] public class meshPainter : MonoBehaviour { void Start () { } void Update () { } }为了自定义脚本的Inspector显示，我们需要一个Style脚本，我们再创建一个meshPainterStyle.cs文件，放在Editor文件下 using UnityEngine; using UnityEditor; using System.IO; using System.Collections; [CustomEditor(typeof(meshPainter))] [CanEditMultipleObjects] public class meshPainterStyle : Editor { public override void OnInspectorGUI() { } }在模型上绘制需要shader和control贴图，所以首先判断当前模型的shader是否正确以及是否有control贴图，如果shader不正确或者control贴图不存在就会显示警告信息，并显示一个生成control贴图的按钮。 string ContolTexName = ""; public override void OnInspectorGUI() { if (Cheak()) { } } //检查 bool Cheak() { bool Cheak = false; Transform Select = Selection.activeTransform; Texture ControlTex = Select.gameObject.GetComponent().sharedMaterial.GetTexture("_Control"); if(Select.gameObject.GetComponent().sharedMaterial.shader == Shader.Find("Mya/texBlend/mya_4tex_blend_diffuce") || Select.gameObject.GetComponent().sharedMaterial.shader == Shader.Find("Mya/texBlend/mya_4tex_blend_normal")) { if(ControlTex == null) { EditorGUILayout.HelpBox("当前模型材质球中未找到Control贴图，绘制功能不可用！", MessageType.Error); if (GUILayout.Button("创建Control贴图")) { creatContolTex(); //Select.gameObject.GetComponent().sharedMaterial.SetTexture("_Control", creatContolTex()); } } else { Cheak = true; } } else { EditorGUILayout.HelpBox("当前模型shader错误！请更换！", MessageType.Error); } return Cheak; } //创建Contol贴图 void creatContolTex() { //创建一个新的Contol贴图 string ContolTexFolder = "Assets/MeshPaint/Controler/"; Texture2D newMaskTex = new Texture2D(512, 512, TextureFormat.ARGB32, true); Color[] colorBase = new Color[512 * 512]; for(int t = 0; t< colorBase.Length; t++) { colorBase[t] = new Color(1, 0, 0, 0); } newMaskTex.SetPixels(colorBase); //判断是否重名 bool exporNameSuccess = true; for(int num = 1; exporNameSuccess; num++) { string Next = Selection.activeTransform.name +"_"+ num; if (!File.Exists(ContolTexFolder + Selection.activeTransform.name + ".png")) { ContolTexName = Selection.activeTransform.name; exporNameSuccess = false; } else if (!File.Exists(ContolTexFolder + Next + ".png")) { ContolTexName = Next; exporNameSuccess = false; } } string path = ContolTexFolder + ContolTexName + ".png"; byte[] bytes = newMaskTex.EncodeToPNG(); File.WriteAllBytes(path, bytes);//保存 AssetDatabase.ImportAsset(path, ImportAssetOptions.ForceUpdate);//导入资源 //Contol贴图的导入设置 TextureImporter textureIm = AssetImporter.GetAtPath(path) as TextureImporter; textureIm.textureFormat = TextureImporterFormat.ARGB32; textureIm.isReadable = true; textureIm.anisoLevel = 9; textureIm.mipmapEnabled = false; textureIm.wrapMode = TextureWrapMode.Clamp; AssetDatabase.ImportAsset(path, ImportAssetOptions.ForceUpdate);//刷新 setContolTex(path);//设置Contol贴图 } //设置Contol贴图 void setContolTex(string peth) { Texture2D ControlTex = (Texture2D)AssetDatabase.LoadAssetAtPath(peth, typeof(Texture2D)); Selection.activeTransform.gameObject.GetComponent().sharedMaterial.SetTexture("_Control", ControlTex); }面板上显示如下： 我们先看一些面板上需要显示什么 编辑模式的开关是一个使用的button样式的toogle，这样就能制作这种类似按钮的开关，点击会按下并保持，再次点击会抬起。 开关的图标使用了系统内置的EditCollider图标，关于如何使用unity内置的图标可以参考雨松大大的这篇文章：Unity3D研究院之系统内置系统图标大整理 而笔刷的大小和强度是两个简单的Slider bool isPaint; float brushSize = 16f; float brushStronger = 0.5f; public override void OnInspectorGUI() { if (Cheak()) { GUIStyle boolBtnOn = new GUIStyle(GUI.skin.GetStyle("Button"));//得到Button样式 isPaint = GUILayout.Toggle(isPaint, EditorGUIUtility.IconContent("EditCollider"), boolBtnOn, GUILayout.Width(35), GUILayout.Height(25));//编辑模式开关 brushSize = (int)EditorGUILayout.Slider("Brush Size", brushSize, 1, 36);//笔刷大小 brushStronger = EditorGUILayout.Slider("Brush Stronger", brushStronger, 0, 1f);//笔刷强度 } }
贴图选择和笔刷选择使用了GUILayout.SelectionGrid（）方法，需要传一个Texture[]进去，我们先写两个函数得到这两个数组 //获取材质球中的贴图 void layerTex() { Transform Select = Selection.activeTransform; texLayer = new Texture[4]; texLayer[0] = AssetPreview.GetAssetPreview(Select.gameObject.GetComponent().sharedMaterial.GetTexture("_Splat0")) as Texture; texLayer[1] = AssetPreview.GetAssetPreview(Select.gameObject.GetComponent().sharedMaterial.GetTexture("_Splat1")) as Texture; texLayer[2] = AssetPreview.GetAssetPreview(Select.gameObject.GetComponent().sharedMaterial.GetTexture("_Splat2")) as Texture; texLayer[3] = AssetPreview.GetAssetPreview(Select.gameObject.GetComponent().sharedMaterial.GetTexture("_Splat3")) as Texture; } //获取笔刷 void IniBrush() { string T4MEditorFolder = "Assets/MeshPaint/Editor/"; ArrayList BrushList = new ArrayList(); Texture BrushesTL; int BrushNum = 0; //从Brush0.png这个文件名开始对Assets/MeshPaint/Editor/Brushes文件夹进行搜索，把搜到的图片加入到ArrayList里 do { BrushesTL = (Texture)AssetDatabase.LoadAssetAtPath(T4MEditorFolder + "Brushes/Brush" + BrushNum + ".png", typeof(Texture)); if (BrushesTL) { BrushList.Add(BrushesTL); } BrushNum++; } while (BrushesTL); brushTex = BrushList.ToArray(typeof(Texture)) as Texture[];//把ArrayList转为Texture[] }通道选择直接获取shader的4个layer上的贴图，笔刷选择部分则检测到Assets/MeshPaint/Editor/Brushes/这个文件夹下面所有Brush+数字命名的png文件，获取这些文件组成一个Texture[]；最后显示在Inspector面板上 public override void OnInspectorGUI() { GUIStyle boolBtnOn = new GUIStyle(GUI.skin.GetStyle("Button"));//得到Button样式 isPaint = GUILayout.Toggle(isPaint, EditorGUIUtility.IconContent("EditCollider"), boolBtnOn, GUILayout.Width(35), GUILayout.Height(25));//编辑模式开关 brushSize = (int)EditorGUILayout.Slider("Brush Size", brushSize, 1, 36);//笔刷大小 brushStronger = EditorGUILayout.Slider("Brush Stronger", brushStronger, 0, 1f);//笔刷强度 layerTex();//获取贴图 IniBrush();//获取笔刷 selTex = GUILayout.SelectionGrid(selTex, texLayer, 4, "gridlist", GUILayout.Width(340), GUILayout.Height(86));//通道选择 selBrush = GUILayout.SelectionGrid(selBrush, brushTex, 9, "gridlist", GUILayout.Width(340), GUILayout.Height(70));//笔刷选择 }最后我们稍微整理下布局 public override void OnInspectorGUI() { if (Cheak()) { GUIStyle boolBtnOn = new GUIStyle(GUI.skin.GetStyle("Button")); GUILayout.BeginHorizontal(); GUILayout.FlexibleSpace(); isPaint = GUILayout.Toggle(isPaint, EditorGUIUtility.IconContent("EditCollider"), boolBtnOn, GUILayout.Width(35), GUILayout.Height(25)); GUILayout.FlexibleSpace(); GUILayout.EndHorizontal(); brushSize = (int)EditorGUILayout.Slider("Brush Size", brushSize, 1, 36); brushStronger = EditorGUILayout.Slider("Brush Stronger", brushStronger, 0, 1f); IniBrush(); layerTex(); GUILayout.BeginHorizontal(); GUILayout.FlexibleSpace(); GUILayout.BeginHorizontal("box", GUILayout.Width(340)); selTex = GUILayout.SelectionGrid(selTex, texLayer, 4, "gridlist", GUILayout.Width(340), GUILayout.Height(86)); GUILayout.EndHorizontal(); GUILayout.FlexibleSpace(); GUILayout.EndHorizontal(); GUILayout.BeginHorizontal(); GUILayout.FlexibleSpace(); GUILayout.BeginHorizontal("box", GUILayout.Width(318)); selBrush = GUILayout.SelectionGrid(selBrush, brushTex, 9, "gridlist", GUILayout.Width(340), GUILayout.Height(70)); GUILayout.EndHorizontal(); GUILayout.FlexibleSpace(); GUILayout.EndHorizontal(); } }此时面板如下图： 在模型上绘画的原理其实很简单，从鼠标位置发射一条射线，碰到模型后返回当前碰撞点的贴图坐标，再计算笔刷大小得到一个区域的像素，用一个颜色覆盖掉原来的像素颜色即可。 void Painter() { Transform CurrentSelect = Selection.activeTransform; MeshFilter temp = CurrentSelect.GetComponent();//获取当前模型的MeshFilter float orthographicSize = (brushSize * CurrentSelect.localScale.x) * (temp.sharedMesh.bounds.size.x / 200);//笔刷在模型上的正交大小 MaskTex = (Texture2D)CurrentSelect.gameObject.GetComponent().sharedMaterial.GetTexture("_Control");//从材质球中获取Control贴图 brushSizeInPourcent = (int)Mathf.Round((brushSize * MaskTex.width) / 100);//笔刷在模型上的大小 bool ToggleF = false; Event e = Event.current;//检测输入 HandleUtility.AddDefaultControl(0); RaycastHit raycastHit = new RaycastHit(); Ray terrain = HandleUtility.GUIPointToWorldRay(e.mousePosition);//从鼠标位置发射一条射线 if (Physics.Raycast(terrain, out raycastHit, Mathf.Infinity, 1 |
Inspector面板已经正确显示出来了。【本文地址】
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