Vellum约束新特性 – H18官方大师班Vellum Constraint Features | John Lynch | H18 Masterclass

This masterclass will cover new Vellum constraint features in Houdini 18, some of which are workflow enhancements. This includes automatically computing mass and thickness based on density, making it easier to work with geometry of different resolutions. Normalizing stress computations over substeps, will save you the hassle of having to adjust threshold values when changing substeps. For the new constraint features, there are Stiffness Dropoff, Tangent Stiffness, Stitch to primitive location, Sliding for Stitch and Attach constraints, and ARAP constraints which are effective for simulating organic material/softbody and things that require good stretching and compression behaviour.
Download scene files here: sidefx.com/tutorials/vellum-constraint-features-john-lynch-h18-masterclass
INDEX
00:03:58 use autocomputation of mass+thickness
00:12:04 Normalize Stress Computations
00:17:14 Stiffness Dropoff with Stretch and Bend Constraints
00:21:41 Tangent Stiffness
00:27:26 Stitch Constraint Enhancements
00:32:32 Sliding Constraints
00:55:22 Triangle and Tetrahedral Stretch (ARAP) Constraints
01:11:01 ARAP Constraints (Shelf Tools)
01:17:41 Tetrahedral Stretch Constraints with Plasticity
01:20:35 ARAP Constraints for Organic Behaviour
01:22:44 Tetrahedral ARAP Constraints
谷歌翻译：
该大师班将介绍Houdini 18中的Vellum约束新功能，其中一些是工作流程的增强。这包括根据密度自动计算质量和厚度，从而更轻松地处理不同分辨率的几何体。通过子步骤对应力计算进行归一化，将避免在更改子步骤时必须调整阈值的麻烦。对于新的约束功能，包括“刚度下降”，“切线刚度”，“到原始位置的缝合”，“滑动缝合和附着”约束以及ARAP约束，这些约束可有效模拟有机材料/软件以及需要良好拉伸和压缩行为的事物。
Download scene files here: sidefx.com/tutorials/vellum-constraint-features-john-lynch-h18-masterclass
指数
00:03:58使用质量+厚度的自动计算
00:12:04归一化应力计算
00:17:14具有拉伸和弯曲约束的刚度下降
00:21:41切线刚度
00:27:26针迹约束增强
00:32:32滑动约束
00:55:22三角形和四面体拉伸（ARAP）约束
01:11:01 ARAP约束（货架工具）
01:17:41具有可塑性的四面体拉伸约束
01:20:35 ARAP对有机行为的限制
01:22:44四面体ARAP约束