Unity 3D涂色

来源：互联网发布：c语言源文件名有那些编辑：程序博客网时间：2024/06/10 09:42

最近一直研究3D 涂色方面的东东其实所为的3d模型上的涂色最终结果都涂在纹理贴图上面

上面的鱼和方块都涂上了红色

源代码如下

// Update is called once per frame
    void Update () {

        if (Input.GetMouseButton (0)) { //点击鼠标移动鼠标开始涂色
            Ray lRay = Camera.main.ScreenPointToRay (Input.mousePosition);
            RaycastHit lHit;
                if (Physics.Raycast (lRay, out lHit,100f,1<<LayerMask.NameToLayer("Game"))) {
                MeshCollider meshCollider =   lHit.transform.GetComponent<MeshCollider> ();

                MeshRenderer lRender = lHit.transform.GetComponent<MeshRenderer> ();
                if (lRender) {
                    Texture2D lTexture = lRender.sharedMaterial.mainTexture as Texture2D;
                    Vector2 pixelUV = lHit.textureCoord;
                    pixelUV.x *= lTexture.width;
                    pixelUV.y *= lTexture.height;   //得到射线点在2d纹理图片上的坐标

                    Draw (pixelUV, lTexture);
                } else {
                    SkinnedMeshRenderer render = lHit.transform.GetComponent<SkinnedMeshRenderer> ();
                    Texture2D lTexture = render.sharedMaterial.mainTexture as Texture2D;
                    Vector2 pixelUV = lHit.textureCoord;
                    pixelUV.x *= lTexture.width;
                    pixelUV.y *= lTexture.height;

                    Draw (pixelUV, lTexture);
                }

            }
        }

    }

// 修改纹理上对应点的颜色

    public void Draw(Vector2 pPoint,Texture2D pTexture)
    {

        Rect lRect = new Rect (0,0,pTexture.width,pTexture.height);

        pPoint -= new Vector2 (brush.width/2,brush.height/2);

        Debug.Log (pPoint.ToString());

        int lX = Mathf.FloorToInt (pPoint.x);
        int lY = Mathf.FloorToInt (pPoint.y);

        for (int i = 0; i < brush.width; i++) {   //Brush 是画笔的纹理（Texture2D）
            for (int j = 0; j < brush.height; j++) {
                Vector2 lPosition = new Vector2 (lX+i,lY+j);
                if (lRect.Contains (lPosition) && brush.GetPixel (i, j).a > 0.8f) {
                    pTexture.SetPixel(lX+i,lY+j,Color.red);
                }
            }
        }

        pTexture.Apply();

    }

0 0