{"id":628,"date":"2022-09-28T17:03:34","date_gmt":"2022-09-28T09:03:34","guid":{"rendered":"https:\/\/blog.mega-zone.org\/?p=628"},"modified":"2023-09-02T08:44:02","modified_gmt":"2023-09-02T00:44:02","slug":"unity%e7%9a%84canvas%e5%9d%90%e6%a0%87%e7%b3%bb%e7%bb%9f","status":"publish","type":"post","link":"https:\/\/blog.mega-zone.org\/?p=628","title":{"rendered":"Unity\u7684Canvas\u5750\u6807\u7cfb\u7edf"},"content":{"rendered":"\n

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\n\/\/ \u81ea\u5b9a\u4e49\u7684\u60c5\u51b5\u4e0b\uff0c\u66f4\u65b0mesh\u540e\u8c03\u7528SetVerticesDirty();\n\/\/ \u7136\u540eoverride UnityEngine.UI.Graphic.UpdateGeometry\u4f20\u5165\u81ea\u5b9a\u4e49\u7684mesh\u3002\nprotected override void UpdateGeometry()\n{\n    canvasRenderer.SetMesh(_custom_mesh); \n}\n\n\/\/ \u6216\u8005\u5728Dirty\u4e4b\u540e\uff0c\u901a\u8fc7OnPopulateMesh()\u4e2d\u76f4\u63a5\u751f\u6210\u9876\u70b9\u6570\u636e\n\/\/ \u57fa\u7c7b\u4f1a\u628a\u8fd9\u4e9b\u9876\u70b9\u653e\u8fdbMesh\u91cc\uff0c\u7701\u53bb\u81ea\u5df1\u521b\u5efamesh\u5bf9\u8c61\u3002\nprotected override void OnPopulateMesh(VertexHelper vh)\n{\n  vh.AddVert(v0);\n  vh.AddVert(v1);\n  vh.AddVert(v2);\n  vh.AddTriangle(0, 1, 2);\n  ...\n}\n<\/pre>\n\n\n\n
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\n\/\/ \u5408\u5e76\u6279\u6b21\u4e4b\u540e\u7684\u9876\u70b9\u6570\u636e\uff1a\n\/\/ mul( GetCanvasTransform(this.RectTransform) , Mesh\u9876\u70b9 )\nMatrix4x4 GetCanvasTransform(Transform t)\n{\n\tMatrix4x4 current = Matrix4x4.identity;\n\twhile (true)\n\t{\n\t\tvar canvas = t.gameObject.GetComponent<canvas>();\n\t\tif (canvas != null &amp;&amp; canvas.isRootCanvas)\n\t\t\treturn current;\n\n\t\tvar m = Matrix4x4.TRS(t.localPosition, t.localRotation, t.localScale) * current;\n\t\tif (t.parent == null)\n\t\t\treturn m;\n\n\t\tcurrent = m;\n\t\tt = t.parent;\n\t}\n}\n<\/pre>\n
<\/canvas><\/p>\n\n\n\n
UI\u7684\u9876\u70b9\u53d8\u6362\u76f8\u5f53\u4e8e(Local->CanvasLocal<\/strong>)->CanvasWorld->View->Clip(Projection)->NDC\uff0c\u524d\u4e24\u6b65\u5bf9\u5e94UI Mesh\u5408\u5e76\u6279\u6b21\u7684\u7ed3\u679c\u3002<\/p>\n\n\n\n
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1\u3001Screen Space – Overlay\u6a21\u5f0f<\/strong>\uff1a\u6b64\u6a21\u5f0f\u5c06\u5728\u5c4f\u5e55\u6700\u4e0a\u65b9\u76f4\u63a5\u6e32\u67d3UI\uff0c\u5ffd\u7565\u4efb\u4f55Camera\u3002\u5728Editor\u4e2d\u8fd9\u4e2a\u6a21\u5f0f\u7684\u8868\u73b0\u5f88\u5947\u602a\uff0c\u7f16\u8f91\u5668\u4e2d\u7684UI\u4e0d\u80fd\u548c\u5f53\u524d\u573a\u666f\u7684\u5bf9\u8c61\u5bf9\u9f50\uff0c\u53ef\u80fd\u5f3a\u5236\u8bbe\u5b9a\u4e86\u4e00\u5957\u5750\u6807\uff0c\u6211\u4e00\u822c\u907f\u514d\u4f7f\u7528\u5b83\uff0c\u4f46\u5b98\u65b9\u8303\u4f8b\u7231\u7528\u8fd9\u4e2a\u6a21\u5f0f\uff0c\u5373\u4f7f\u6e38\u620f\u4e2d\u53ea\u6709\u4e00\u4e2aCamera\u3002<\/p>\n\n\n\n
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2\u3001Screen Space – Camera\u6a21\u5f0f<\/strong>\uff1a\u6b64\u6a21\u5f0f\u5c06\u5728Camera\u6b63\u5bf9\u7684\u5e73\u9762\u4e0a\u6e32\u67d3UI\uff0cCanvas\u7684\u8303\u56f4\u662f\u8be5Camera\u7684Viewport\uff0c\u76f8\u5f53\u4e8e\u5728billboards\u4e0a\u6e32\u67d3UI\u3002\u5728\u7f16\u8f91\u5668\u4e2d\u53ef\u4ee5\u770b\u5230\uff0cCanvas\u4f1a\u8ddf\u7740Camera\u65cb\u8f6c\uff0c\u59cb\u7ec8\u6b63\u5bf9Camera\u3002<\/p>\n\n\n\n
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============================<\/p>\n\n\n\n
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\u603b\u7ed3\u4e00\u4e0b\u5c31\u662f\uff1a<\/p>\n\n\n\n
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2\u3001\u6839\u636eCanvas\u6e32\u67d3\u6a21\u5f0f\u7684\u4e0d\u540c\uff0cView\u548cProjection\u4f1a\u88ab\u5206\u522b\u8bbe\u7f6e\u3002<\/p>\n\n\n\n
3\u3001\u9664\u4e86World Space – Camera\u6a21\u5f0f\uff0c\u6240\u6709Canvas\u6811\u5f62\u7ed3\u6784\u4e2d\u7684\u5bf9\u8c61\uff0c\u5176Transform\u5747\u4e0d\u53d7Canvas\u5c42\u4ee5\u4e0a\u7684\u7236\u8282\u70b9\u5f71\u54cd\u3002\u8fd9\u548c\u666e\u901a\u7684Scene\u5bf9\u8c61\u6709\u533a\u522b\u3002<\/p>\n\n\n\n
4\u3001\u5982\u679c\u5e0c\u671b\u5728shader\u4e2d\u83b7\u53d6UI Mesh\u7684Local\u5750\u6807\uff0c\u53ef\u4ee5\u901a\u8fc7\u4f20\u5165GetCanvasTransform()\u8ba1\u7b97\u7ed3\u679c\u7684\u9006\u77e9\u9635\uff0c\u7136\u540e\u548c\u9876\u70b9\u5750\u6807\u76f8\u4e58\u6765\u83b7\u5f97\u3002<\/p>\n\n\n
\n\/\/ material.SetMatrix("canvas_transform_inverse", GetCanvasTransform(this.rectTransform).inverse);\nfloat2 local = mul( canvas_transform_inverse, float4(vertex, 0.0, 1.0) );\n<\/pre>\n\n\n\n
<\/p>\n\n\n\n
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