如何让顶点颜色在 Unity 项目中工作？

问题描述

我正在尝试以编程方式创建网格，并且在使用 UV 时能够看到网格。但现在我试图在网格上使用颜色，以便每 4 行颜色不同（例如图表的短轴和长轴），但现在网格不会显示。

我尝试过的事情：

• 我相信我已经实现了通用渲染管线（Universal RP）来创建一个顶点颜色着色器。但这没有用。

• 我也尝试过使用内置的粒子/标准单元着色器。这不起作用，当我更改为通用 RP 时，我相信它破坏了它，因为材料在预览窗格中显示为粉红色。

• 还从其他应该解决此问题的 stackoverflow 答案中复制了几个着色器。

这是我生成网格的代码。

    public class Grid : MonoBehavIoUr
    {
    
        public float thickness = 0.001f;
        public float spacing = 2f;
        public int major = 4;
        public Color majorColor;
        public Color minorColor;
    
        private Vector3[] vertices;
        private int[] triangles;
        private Color[] colors;
        
        private void Start()
        {
            transform.localScale = new Vector3(216f,279.5f,0.01f);
            DrawGrid();
        }
        
        public void DrawGrid()
        {
            Vector2Int numLines = new Vector2Int
            {
                x = Mathf.FloorToInt(transform.localScale.x / (spacing + thickness)),y = Mathf.FloorToInt(transform.localScale.y / (spacing + thickness))
            };
            int totalLines = numLines.x + numLines.y;
            int verticesPerLine = 4;
            int triangleIdxPerLine = 6;
            int numVertices = totalLines * verticesPerLine;
            int numTriangles = totalLines * triangleIdxPerLine;
            
            vertices = new Vector3[numVertices];
            triangles = new int[numTriangles];
            colors = new Color[numVertices];
            
            var minorSpacing = spacing / transform.localScale.x;
            
            int i = 0;
            for (float x = 0.0f; x < 1; x += minorSpacing + thickness,i++)
                DrawLine(i,new Vector2(x,0.0f),new Vector2(x + thickness,1.0f));
            
            for (float y = 0.0f; y < 1; y += minorSpacing + thickness,new Vector2(0.0f,y),new Vector2(1.0f,y + thickness));
            print(colors.Length);
            print(majorColor);
            GetComponent<MeshFilter>().mesh = new Mesh
            {
                vertices = vertices,colors = colors,triangles = triangles
            };
        }
        
        private void DrawLine(int idx,Vector2 point1,Vector2 point2) {
            int vOffset = idx * 4;
            vertices[vOffset] = new Vector3(point1.x,point1.y);
            vertices[vOffset + 1] = new Vector3(point2.x,point2.y);
            vertices[vOffset + 2] = new Vector3(point1.x,point2.y);
            vertices[vOffset + 3] = new Vector3(point2.x,point1.y);
            
            Color color = idx % major == 0 ? majorColor : minorColor;
            colors[vOffset] = color;
            colors[vOffset + 1] = color;
            colors[vOffset + 2] = color;
            colors[vOffset + 3] = color;
            
            int tOffset = idx * 6;
            triangles[tOffset] = vOffset;
            triangles[tOffset + 1] = vOffset + 1;
            triangles[tOffset + 2] = vOffset + 2;
            triangles[tOffset + 3] = vOffset + 1;
            triangles[tOffset + 4] = vOffset;
            triangles[tOffset + 5] = vOffset + 3;
        }
    }
    

解决方法

我是在这个 YT 教程 https://www.youtube.com/watch?v=eJEpeUH1EMg 的帮助下弄明白的。

我正在我的相机指向的另一侧渲染三角形。

只是改变了三角形索引的顺序。

@method_decorator(csrf_exempt,name='dispatch')
class APIAccounts(View):

    def get(self,requests):
        if requests.user.is_authenticated:
            try:
                return JsonResponse(UserProfileInfo.get_accounts(requests.user.id),status=200)
            except AttributeError:
                return JsonResponse({"message": "Access denied"},status=403)
        else:
            return JsonResponse({"message": "Unauthenticated"},status=401)

    def post(self,requests):
        if requests.user.is_authenticated:
            try:
                try:
                    data = UserProfileInfo.objects.get(user_id=requests.user.id)
                    form = PatchUserProfileForm(requests.POST,requests.FILES,instance=data)

                except ObjectDoesNotExist:
                    # problem: how can I squeeze the user_id to the record
                    form = PatchUserProfileForm(requests.POST,requests.FILES)
                if form.is_valid():
                    form.save()

            except Exception as e:
                raise e.with_traceback(e.__traceback__)
            else:
                return JsonResponse({'message': 'Update successfully'},status=200)