{"id":2073,"date":"2019-06-23T01:08:42","date_gmt":"2019-06-22T22:08:42","guid":{"rendered":"http:\/\/demensdeum.com\/blog\/?p=2073"},"modified":"2024-12-16T22:32:36","modified_gmt":"2024-12-16T19:32:36","slug":"skeletal-animation-1","status":"publish","type":"post","link":"https:\/\/demensdeum.com\/blog\/zh\/2019\/06\/23\/skeletal-animation-1\/","title":{"rendered":"\u9aa8\u9abc\u52a8\u753b\uff08\u7b2c 1 \u90e8\u5206–\u7740\u8272\u5668\uff09"},"content":{"rendered":"

\u5728\u672c\u6587\u4e2d\uff0c\u6211\u5c06\u63cf\u8ff0\u6211\u5bf9\u9aa8\u9abc\u52a8\u753b\u7684\u7406\u89e3\uff0c\u9aa8\u9abc\u52a8\u753b\u5728\u6240\u6709\u73b0\u4ee3 3D \u5f15\u64ce\u4e2d\u7528\u4e8e\u52a8\u753b\u89d2\u8272\u3001\u6e38\u620f\u73af\u5883\u7b49\u3002
\u6211\u5c06\u4ece\u6700\u5177\u4f53\u7684\u90e8\u5206\u5f00\u59cb\u63cf\u8ff0\u2014\u2014\u9876\u70b9\u7740\u8272\u5668\uff0c\u56e0\u4e3a\u6574\u4e2a\u8ba1\u7b97\u8def\u5f84\uff0c\u65e0\u8bba\u591a\u4e48\u590d\u6742\uff0c\u6700\u7ec8\u90fd\u4f1a\u5c06\u51c6\u5907\u597d\u7684\u7528\u4e8e\u663e\u793a\u7684\u6570\u636e\u4f20\u8f93\u5230\u9876\u70b9\u7740\u8272\u5668\u3002<\/p>\n

\"\"<\/p>\n

\u9aa8\u9abc\u52a8\u753b\u7ecf\u8fc7CPU\u5904\u7406\u540e\uff0c\u8fdb\u5165\u9876\u70b9\u7740\u8272\u5668\u3002
\u8ba9\u6211\u63d0\u9192\u4e00\u4e0b\u6ca1\u6709\u9aa8\u9abc\u52a8\u753b\u7684\u9876\u70b9\u7684\u516c\u5f0f\uff1a
gl_Position = \u6295\u5f71\u77e9\u9635 * \u89c6\u56fe\u77e9\u9635 * \u6a21\u578b\u77e9\u9635 * \u9876\u70b9;
\u5bf9\u4e8e\u90a3\u4e9b\u4e0d\u660e\u767d\u8fd9\u4e2a\u516c\u5f0f\u662f\u5982\u4f55\u4ea7\u751f\u7684\u4eba\uff0c\u60a8\u53ef\u4ee5\u9605\u8bfb\u6211\u7684\u6587\u7ae0\uff0c\u8be5\u6587\u7ae0\u63cf\u8ff0\u4e86\u5728 OpenGL \u4e0a\u4e0b\u6587\u4e2d\u4f7f\u7528\u77e9\u9635\u663e\u793a 3D \u5185\u5bb9\u7684\u539f\u7406\u3002
\u5bf9\u4e8e\u5176\u4f59\u7684–\u9aa8\u9abc\u52a8\u753b\u7684\u5b9e\u73b0\u516c\u5f0f\uff1a
” vec4animatedVertex=bone0matrix*\u9876\u70b9*bone0weight+”
“\u9aa8\u9abc1\u77e9\u9635 * \u9876\u70b9 * \u9aa8\u9abc1\u6743\u91cd +”
“\u9aa8\u9abc2\u77e9\u9635 * \u9876\u70b9 * \u9aa8\u9abc2\u6743\u91cd +”
“\u9aa8\u9abc3\u77e9\u9635 * \u9876\u70b9 * \u9aa8\u9abc3\u6743\u91cd;\\n”
” gl_Position = \u6295\u5f71\u77e9\u9635 * \u89c6\u56fe\u77e9\u9635 * \u6a21\u578b\u77e9\u9635 * \u52a8\u753b\u9876\u70b9;\\n”<\/p>\n

\u4e5f\u5c31\u662f\u8bf4\uff0c\u6211\u4eec\u5c06\u6700\u7ec8\u7684\u9aa8\u9abc\u53d8\u6362\u77e9\u9635\u4e58\u4ee5\u9876\u70b9\u4ee5\u53ca\u8be5\u77e9\u9635\u76f8\u5bf9\u4e8e\u9876\u70b9\u7684\u6743\u91cd\u3002\u6bcf\u4e2a\u9876\u70b9\u53ef\u4ee5\u75314\u4e2a\u9aa8\u9abc\u8fdb\u884c\u52a8\u753b\uff0c\u51b2\u51fb\u7684\u5f3a\u5ea6\u7531\u9aa8\u9abc\u6743\u91cd\u53c2\u6570\u8c03\u8282\uff0c\u51b2\u51fb\u7684\u603b\u548c\u5e94\u7b49\u4e8e1\u3002
\u5982\u679c\u5f71\u54cd\u9876\u70b9\u7684\u9aa8\u9abc\u5c11\u4e8e 4 \u4e2a\u600e\u4e48\u529e\uff1f\u6211\u4eec\u9700\u8981\u5c06\u5b83\u4eec\u4e4b\u95f4\u7684\u6743\u91cd\u5206\u5f00\uff0c\u5e76\u4f7f\u5176\u4f59\u7684\u5f71\u54cd\u4e3a\u96f6\u3002
\u4ece\u6570\u5b66\u4e0a\u8bb2\uff0c\u6743\u91cd\u4e58\u4ee5\u77e9\u9635\u79f0\u4e3a\u201c\u77e9\u9635\u6807\u91cf\u4e58\u6cd5\u201d\u3002\u4e58\u4ee5\u4e00\u4e2a\u6807\u91cf\u53ef\u4ee5\u8ba9\u60a8\u603b\u7ed3\u77e9\u9635\u5bf9\u7ed3\u679c\u9876\u70b9\u7684\u5f71\u54cd\u3002<\/p>\n

\u9aa8\u9abc\u53d8\u6362\u77e9\u9635\u672c\u8eab\u4f5c\u4e3a\u6570\u7ec4\u4f20\u8f93\u3002 <\/strong>\u6b64\u5916\uff0c\u8be5\u6570\u7ec4\u5305\u542b\u6574\u4e2a\u6a21\u578b\u7684\u77e9\u9635\uff0c\u800c\u4e0d\u662f\u5355\u72ec\u7684\u6bcf\u4e2a\u7f51\u683c\u7684\u77e9\u9635\u3002<\/p>\n

\u4f46\u662f\u5bf9\u4e8e\u6bcf\u4e2a\u9876\u70b9\uff0c\u4ee5\u4e0b\u4fe1\u606f\u662f\u5355\u72ec\u4f20\u8f93\u7684\uff1a
–\u5f71\u54cd\u9876\u70b9\u7684\u77e9\u9635\u7d22\u5f15
–\u5f71\u54cd\u9876\u70b9\u7684\u77e9\u9635\u6743\u91cd
\u4f20\u8f93\u591a\u4e8e\u4e00\u6839\u9aa8\u9abc\uff0c\u901a\u5e38\u4f7f\u7528\u9876\u70b9\u4e0a4\u6839\u9aa8\u9abc\u7684\u6548\u679c\u3002
\u53e6\u5916\uff0c4 \u4e2a\u9ab0\u5b50\u7684\u6743\u91cd\u4e4b\u548c\u5fc5\u987b\u59cb\u7ec8\u7b49\u4e8e 1\u3002
\u63a5\u4e0b\u6765\u6211\u4eec\u770b\u770b\u5b83\u5728\u7740\u8272\u5668\u4e2d\u7684\u6837\u5b50\u3002
\u77e9\u9635\u6570\u7ec4\uff1a
“\u7edf\u4e00 mat4 \u9aa8\u9abc\u77e9\u9635[kMaxBones];”<\/p>\n

\u6709\u5173\u6bcf\u4e2a\u9876\u70b9\u4e0a 4 \u4e2a\u9aa8\u9abc\u7684\u6548\u679c\u7684\u4fe1\u606f\uff1a
“\u5c5e\u6027 vec2bon0info;”
“\u5c5e\u6027 vec2bon1info;”
“\u5c5e\u6027 vec2\u9aa8\u59342info;”
“\u5c5e\u6027 vec2bon3info;”<\/p>\n

vec2 –\u5728 X \u5750\u6807\u4e2d\uff0c\u6211\u4eec\u5b58\u50a8\u9aa8\u9abc\u7684\u7d22\u5f15\uff08\u5e76\u5728\u7740\u8272\u5668\u4e2d\u5c06\u5176\u8f6c\u6362\u4e3a int\uff09\uff0c\u5728 Y \u5750\u6807\u4e2d\uff0c\u6211\u4eec\u5b58\u50a8\u9aa8\u9abc\u5bf9\u9876\u70b9\u7684\u5f71\u54cd\u7684\u6743\u91cd\u3002\u4e3a\u4ec0\u4e48\u5fc5\u987b\u4ee5\u4e8c\u7ef4\u5411\u91cf\u4f20\u8f93\u8fd9\u4e9b\u6570\u636e\uff1f\u56e0\u4e3a GLSL \u4e0d\u652f\u6301\u5c06\u5177\u6709\u6709\u6548\u5b57\u6bb5\u7684 C \u53ef\u8bfb\u7ed3\u6784\u4f20\u9012\u7ed9\u7740\u8272\u5668\u3002<\/p>\n

\u4e0b\u9762\u6211\u5c06\u7ed9\u51fa\u4e00\u4e2a\u4ece\u5411\u91cf\u4e2d\u83b7\u53d6\u5fc5\u8981\u4fe1\u606f\u4ee5\u8fdb\u4e00\u6b65\u4ee3\u5165animatedVertex\u516c\u5f0f\u7684\u793a\u4f8b\uff1a<\/p>\n

“int boone0Index = int(bone0info.x);”
“\u6d6e\u52a8\u9aa8\u59340\u6743\u91cd=\u9aa8\u59340info.y;”
“mat4\u9aa8\u59340\u77e9\u9635=\u9aa8\u5934Matrices[bone0Index];”<\/p>\n

“int boone1Index = int(bone1info.x);”
“\u6d6e\u52a8\u9aa8\u59341\u6743\u91cd=\u9aa8\u59341info.y;”
“mat4\u9aa81\u77e9\u9635=\u9aa8\u5934Matrices[bone1Index];”<\/p>\n

“int\u9aa8\u59342Index = int(bone2info.x);”
“\u6d6e\u52a8\u9aa8\u59342\u6743\u91cd=\u9aa8\u59342info.y;”
“mat4\u9aa82\u77e9\u9635=\u9aa8\u5934Matrices[bone2Index];”<\/p>\n

“int\u9aa8\u59343Index = int(bone3info.x);”
“\u6d6e\u52a8\u9aa8\u59343\u6743\u91cd=\u9aa8\u59343info.y;”
“mat4\u9aa8\u59343\u77e9\u9635=\u9aa8\u5934Matrices[bone3Index];”<\/p>\n

\u73b0\u5728 CPU \u4e0a\u586b\u5145\u7684\u9876\u70b9\u7ed3\u6784\u5e94\u5982\u4e0b\u6240\u793a\uff1a
x\u3001y\u3001z\u3001u\u3001v\u3001bone0index\u3001bone0weight\u3001bone1index\u3001bone1weight\u3001bone2index\u3001bone2weight\u3001bone3index\u3001bone3weight<\/p>\n

\u9876\u70b9\u7f13\u51b2\u533a\u7ed3\u6784\u5728\u6a21\u578b\u52a0\u8f7d\u671f\u95f4\u586b\u5145\u4e00\u6b21\uff0c\u4f46\u53d8\u6362\u77e9\u9635\u4f1a\u5728\u6bcf\u4e2a\u6e32\u67d3\u5e27\u4ece CPU \u4f20\u8f93\u5230\u7740\u8272\u5668\u3002<\/p>\n

\u5728\u5269\u4e0b\u7684\u90e8\u5206\u4e2d\uff0c\u6211\u5c06\u63cf\u8ff0\u5728CPU\u4e0a\u8ba1\u7b97\u52a8\u753b\u7684\u539f\u7406\uff0c\u5728\u5c06\u5176\u4f20\u8f93\u5230\u9876\u70b9\u7740\u8272\u5668\u4e4b\u524d\uff0c\u6211\u5c06\u63cf\u8ff0\u9aa8\u9abc\u8282\u70b9\u6811\uff0c\u904d\u5386\u52a8\u753b-\u6a21\u578b-\u8282\u70b9-\u7f51\u683c\u5c42\u6b21\u7ed3\u6784\uff0c\u77e9\u9635\u63d2\u503c\u3002<\/p>\n

\u6765\u6e90<\/h3>\n

http:\/\/ogldev.atspace.co\u3002\u82f1\u56fd\/www\/tutorial38\/tutorial38.html<\/a><\/p>\n

\u6e90\u4ee3\u7801<\/h3>\n

https:\/\/gitlab.com\/demensdeum\/skeletal-animation<\/a <\/p>\n","protected":false},"excerpt":{"rendered":"

\u5728\u672c\u6587\u4e2d\uff0c\u6211\u5c06\u63cf\u8ff0\u6211\u5bf9\u9aa8\u9abc\u52a8\u753b\u7684\u7406\u89e3\uff0c\u9aa8\u9abc\u52a8\u753b\u5728\u6240\u6709\u73b0\u4ee3 3D \u5f15\u64ce\u4e2d\u7528\u4e8e\u52a8\u753b\u89d2\u8272\u3001\u6e38\u620f\u73af\u5883\u7b49\u3002\u6211\u5c06\u4ece\u6700\u5177\u4f53\u7684\u90e8\u5206\u5f00\u59cb\u63cf\u8ff0\u2014\u2014\u9876\u70b9\u7740\u8272\u5668\uff0c\u56e0\u4e3a\u6574\u4e2a\u8ba1\u7b97\u8def\u5f84\uff0c\u65e0\u8bba\u591a\u4e48\u590d\u6742\uff0c\u6700\u7ec8\u90fd\u4f1a\u5c06\u51c6\u5907\u597d\u7684\u7528\u4e8e\u663e\u793a\u7684\u6570\u636e\u4f20\u8f93\u5230\u9876\u70b9\u7740\u8272\u5668\u3002 \u9aa8\u9abc\u52a8\u753b\u7ecf\u8fc7CPU\u5904\u7406\u540e\uff0c\u8fdb\u5165\u9876\u70b9\u7740\u8272\u5668\u3002\u8ba9\u6211\u63d0\u9192\u4e00\u4e0b\u6ca1\u6709\u9aa8\u9abc\u52a8\u753b\u7684\u9876\u70b9\u7684\u516c\u5f0f\uff1agl_Position = \u6295\u5f71\u77e9\u9635 * \u89c6\u56fe\u77e9\u9635 * \u6a21\u578b\u77e9\u9635 * \u9876\u70b9;\u5bf9\u4e8e\u90a3\u4e9b\u4e0d\u660e\u767d\u8fd9\u4e2a\u516c\u5f0f\u662f\u5982\u4f55\u4ea7\u751f\u7684\u4eba\uff0c\u60a8\u53ef\u4ee5\u9605\u8bfb\u6211\u7684\u6587\u7ae0\uff0c\u8be5\u6587\u7ae0\u63cf\u8ff0\u4e86\u5728 OpenGL \u4e0a\u4e0b\u6587\u4e2d\u4f7f\u7528\u77e9\u9635\u663e\u793a 3D \u5185\u5bb9\u7684\u539f\u7406\u3002\u5bf9\u4e8e\u5176\u4f59\u7684–\u9aa8\u9abc\u52a8\u753b\u7684\u5b9e\u73b0\u516c\u5f0f\uff1a” vec4animatedVertex=bone0matrix*\u9876\u70b9*bone0weight+”“\u9aa8\u9abc1\u77e9\u9635 * \u9876\u70b9 * \u9aa8\u9abc1\u6743\u91cd +”“\u9aa8\u9abc2\u77e9\u9635 * \u9876\u70b9 * \u9aa8\u9abc2\u6743\u91cd +”“\u9aa8\u9abc3\u77e9\u9635 * \u9876\u70b9 * \u9aa8\u9abc3\u6743\u91cd;\\n”” gl_Position = \u6295\u5f71\u77e9\u9635 * \u89c6\u56fe\u77e9\u9635 * \u6a21\u578b\u77e9\u9635 * \u52a8\u753b\u9876\u70b9;\\n” \u4e5f\u5c31\u662f\u8bf4\uff0c\u6211\u4eec\u5c06\u6700\u7ec8\u7684\u9aa8\u9abc\u53d8\u6362\u77e9\u9635\u4e58\u4ee5\u9876\u70b9\u4ee5\u53ca\u8be5\u77e9\u9635\u76f8\u5bf9\u4e8e\u9876\u70b9\u7684\u6743\u91cd\u3002\u6bcf\u4e2a\u9876\u70b9\u53ef\u4ee5\u75314\u4e2a\u9aa8\u9abc\u8fdb\u884c\u52a8\u753b\uff0c\u51b2\u51fb\u7684\u5f3a\u5ea6\u7531\u9aa8\u9abc\u6743\u91cd\u53c2\u6570\u8c03\u8282\uff0c\u51b2\u51fb\u7684\u603b\u548c\u5e94\u7b49\u4e8e1\u3002\u5982\u679c\u5f71\u54cd\u9876\u70b9\u7684\u9aa8\u9abc\u5c11\u4e8e 4 \u4e2a\u600e\u4e48\u529e\uff1f\u6211\u4eec\u9700\u8981\u5c06\u5b83\u4eec\u4e4b\u95f4\u7684\u6743\u91cd\u5206\u5f00\uff0c\u5e76\u4f7f\u5176\u4f59\u7684\u5f71\u54cd\u4e3a\u96f6\u3002\u4ece\u6570\u5b66\u4e0a\u8bb2\uff0c\u6743\u91cd\u4e58\u4ee5\u77e9\u9635\u79f0\u4e3a\u201c\u77e9\u9635\u6807\u91cf\u4e58\u6cd5\u201d\u3002\u4e58\u4ee5\u4e00\u4e2a\u6807\u91cf\u53ef\u4ee5\u8ba9\u60a8\u603b\u7ed3\u77e9\u9635\u5bf9\u7ed3\u679c\u9876\u70b9\u7684\u5f71\u54cd\u3002 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