{"topic":{"id":8851,"title":"实验 2.12 模拟时物体运动速度过快","slug":"topic","userId":1578,"categoryId":56,"createdAt":"2024-01-02 16:26:26.658359","bumpedAt":"2024-01-03 11:19:58.923851","views":220,"postsCount":3,"highestPostNumber":3,"likeCount":0,"closed":true,"pinned":false,"pinnedGlobally":false,"pinnedAt":null,"pinnedUntil":null,"isBanner":false,"excerpt":"请问在图形学物理模拟部分的实验中，出现物体运动速度非常快有哪些可能的原因？是迭代方法出现问题还是 simulation_update 的逻辑不对呢就是在模拟界面中，物体在不到 1 秒之内就完成了理论上 6 秒的斜抛过程","deletedAt":null,"isAnonymous":false,"isPrivate":false,"isMembersOnly":false,"category":{"id":56,"name":"计算机图形学","slug":"cg","color":"92278F"},"author":{"id":1578,"username":"56307751","name":"稀饭配豆干","avatarUrl":null},"realAuthor":{"id":1578,"username":"56307751","name":"稀饭配豆干","avatarUrl":null},"tags":[]},"posts":[{"id":21120,"postNumber":1,"raw":"请问在图形学物理模拟部分的实验中，出现物体运动速度非常快有哪些可能的原因？是迭代方法出现问题还是 simulation_update 的逻辑不对呢\n就是在模拟界面中，物体在不到 1 秒之内就完成了理论上 6 秒的斜抛过程","cooked":"

请问在图形学物理模拟部分的实验中，出现物体运动速度非常快有哪些可能的原因？是迭代方法出现问题还是 simulation_update 的逻辑不对呢
\n就是在模拟界面中，物体在不到 1 秒之内就完成了理论上 6 秒的斜抛过程

\n","createdAt":"2024-01-02 16:26:26.745698","updatedAt":"2024-01-02 16:26:26.745698","replyToPostNumber":null,"replyCount":0,"likeCount":0,"wordCount":87,"liked":false,"bookmarked":false,"polls":[],"reactions":[],"wiki":false,"version":1,"publicVersion":1,"deletedAt":null,"isAnonymous":false,"user":{"id":1578,"username":"56307751","name":"稀饭配豆干","avatarUrl":null,"admin":false,"moderator":false,"signatureRaw":null,"signatureCooked":null}},{"id":21133,"postNumber":2,"raw":"可能是速度更新公式存在问题。我曾经短暂遇到这个问题。","cooked":"

可能是速度更新公式存在问题。我曾经短暂遇到这个问题。

\n","createdAt":"2024-01-03 06:56:50.120624","updatedAt":"2024-01-03 06:56:50.120624","replyToPostNumber":null,"replyCount":0,"likeCount":0,"wordCount":26,"liked":false,"bookmarked":false,"polls":[],"reactions":[],"wiki":false,"version":1,"publicVersion":1,"deletedAt":null,"isAnonymous":false,"user":{"id":178,"username":"Hypocrisy","name":"rotartsinimdA","avatarUrl":"/uploads/image/ce/f3/cef3773e378e161524cc7523c8a63dff0698d22802b0c1ab669894d395ee36a3.avif","admin":false,"moderator":true,"signatureRaw":null,"signatureCooked":null}},{"id":21150,"postNumber":3,"raw":"求解函数或者 update 逻辑不对都有可能。由于斜抛的运动过程比较简单可以手算，建议首先输出 log 检查一下用于求解的 `forward_euler_step` 等函数是否返回了正确的下一步状态；如果求解结果正确，再检查每次进入 `simulation_update` 之后可用的总时长（即渲染帧时长）与当前 GUI 界面上显示的 FPS 是否匹配（渲染帧时长应该是 FPS 的倒数），不匹配就是时间算错了。","cooked":"

求解函数或者 update 逻辑不对都有可能。由于斜抛的运动过程比较简单可以手算，建议首先输出 log 检查一下用于求解的 forward_euler_step 等函数是否返回了正确的下一步状态；如果求解结果正确，再检查每次进入 simulation_update 之后可用的总时长（即渲染帧时长）与当前 GUI 界面上显示的 FPS 是否匹配（渲染帧时长应该是 FPS 的倒数），不匹配就是时间算错了。

\n","createdAt":"2024-01-03 11:19:58.923851","updatedAt":"2024-01-03 11:19:58.923851","replyToPostNumber":null,"replyCount":0,"likeCount":0,"wordCount":141,"liked":false,"bookmarked":false,"polls":[],"reactions":[],"wiki":false,"version":1,"publicVersion":1,"deletedAt":null,"isAnonymous":false,"user":{"id":1381,"username":"greyishsong","name":"greyishsong","avatarUrl":"/uploads/image/da/bc/dabc731b0311f59850625bbeb55ed969fcfac0430c5ef0f68441e5466b7aa496.avif","admin":false,"moderator":true,"signatureRaw":null,"signatureCooked":null}}],"hasMore":false,"lastReadPostNumber":1,"hasUrlPostNumber":false}