转载转载
https://www.cnblogs.com/j349900963/p/8340571.html
截取里面俩代码，可以实现图片挖洞的需求
注意：
hole image 需要 将图片的透明度调整为1
public class Hole : Mask
{
public override bool IsRaycastLocationValid(Vector2 sp, Camera eventCamera)
{
if (!isActiveAndEnabled)
return true;
return !RectTransformUtility.RectangleContainsScreenPoint(rectTransform, sp, eventCamera);
}
}
public class HoleImage : Image { public override Material GetModifiedMaterial(Material baseMaterial) { var toUse = baseMaterial; if (m_ShouldRecalculateStencil) { var rootCanvas = MaskUtilities.FindRootSortOverrideCanvas(transform); m_StencilValue = maskable ? MaskUtilities.GetStencilDepth(transform, rootCanvas) : 0; m_ShouldRecalculateStencil = false; } // if we have a enabled Mask component then it will // generate the mask material. This is an optimisation // it adds some coupling between components though :( Mask maskComponent = GetComponent<Mask>(); if (m_StencilValue > 0 && (maskComponent == null || !maskComponent.IsActive())) { var maskMat = StencilMaterial.Add(toUse, (1 << m_StencilValue) - 1, StencilOp.Keep, CompareFunction.NotEqual, ColorWriteMask.All, (1 << m_StencilValue) - 1, 0); StencilMaterial.Remove(m_MaskMaterial); m_MaskMaterial = maskMat; toUse = m_MaskMaterial; } return toUse; } }
原文：https://www.cnblogs.com/leilei-weapon/p/10415274.html