Differential Growth (Blender Geometry-Nodes) for Blender 3.6-4.1

Blender 幾何節(jié)點設置，用于微分增長模擬。

參數摘要

速度：應用于每幀點的偏移強度。值越高，模擬越“快”，但結果越不準確，發(fā)生碰撞/重疊的可能性越大。

可見性半徑：點相互影響的最大距離。

重新采樣長度：曲線的重新采樣長度。

吸引力：吸引力參數僅在提供非空吸引子集合時才有效。根據因子值，點將被吸引到比給定最大距離更近的表面。

排斥力：排斥力對曲線的其他點和容器集合中的任何其他對象起作用（如果提供）。根據因子值，曲線將被推離比給定最大距離更近的點。

3D 增長：是否在所有三個軸上運行增長。

保留舊狀態(tài)：保留以前迭代的結果。

保留舊狀態(tài) - 跳過幀：跳過多少幀。 0 表示保留所有幀。

僅對最后狀態(tài)進行采樣：如果為真，排斥力僅在最后一幀上起作用（僅當“保留舊狀態(tài)”為真時才相關）。

輪廓曲線半徑：如果為 0，則只輸出一條曲線，否則將曲線應用于具有此半徑的網格。

容器集合：如果提供，則將充當屏障/邊界的對象（與排斥參數相關）。

吸引器集合：如果提供，則將充當吸引器的對象（與吸引力參數相關）。

容器/吸引器點密度 (x100)：值越高，交互越準確。

較低的可見性半徑會導致更詳細的增長，因為它會考慮較小部分的鄰居點來調整增長，實際上會降低曲線的整體平滑度。詳細的增長還需要重采樣長度適合您正在運行的模擬的規(guī)模。可見性半徑應大于重采樣長度，否則曲線不會受到太大影響或崩潰。

如果模擬變得太重，請嘗試減少重采樣長度。

Blender geometry-nodes setup for differential-growth simulation.

Use the differential_growth group to run the simulation on a provided input curve object.

Summary of parameters：

Speed: strength of the shift applied to points at each frame. Higher values will result in a "faster" simulation, but less accurate results and more chances of collisions/overlap.

Visibility Radius: max distance for points to affect each others.

Resample Length: resample length for the curve.

Attraction: attraction parameters work only when a non-empty attractor collection is provided. The points will be attracted to surfaces closer than the given max distance, based on the factor value.

Repulsion: repulsion works against other points of the curve and any other object in the container collection (if provided). The curve will be pushed away from points closer than the given max distance, based on the factor value.

3D Growth: whether to run growth on all three axes.

Keep Old States: keep results from previous iterations.

Keep Old States - Frame Skip: how many frames to skip. 0 means keep all frames.

Sample Last State Only: if true repulsion works only on the last frame (relevant only if Keep Old States is True).

Profile Curve Radius: If 0 just output a curve, otherwise applies curve to mesh with this radius.

Container Collection: If provided, objects that will act as barrier/boundary (relevant for repulsion parameters).

Attractor Collection: If provided, objects that will act as attractors (relevant for attraction parameters).

Container/Attractor Points Density (x100): higher values make for more accurate interactions.

Lower Visibility Radius causes more detailed growth, as it consider a smaller portion of neighbors points to adjust the growth, reducing in fact the overall smoothness of the curve. Detailed growth also required a Resample Length fit for the scale of the simulation you are running. Visibility Radius should be greater than the Resample Length, otherwise the curve won't be affected much or collapse.

If the simulation gets too heavy, try reducing the Resample Length.