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Obstacle Parameters Rollout

Create panel > Space Warps > Particles & Dynamics > Object Type rollout > Vector Field > Obstacle Parameters rollout

Select a Vector Field space warp. > Modify panel > Obstacle Parameters rollout

A vector field serves to let crowd members avoid other objects in the scene. It consists of a three-dimensional array of vectors generated around an obstacle object, which serve to guide objects around the object. The settings in this rollout help determine how the vectors are generated and displayed, and how they affect other objects.

Note: Objects are subject to a vector field's forces only if they are bound to the field with a Crowd object. For general usage guidelines, see To use a Vector Field space warp.

Interface

Display group

The first four controls in this group let you enable and disable display of four different elements of the Vector Field space warp.

Note: You can select a Vector Field space warp in the viewport by clicking any of its visible elements except the range representation. If you've turned off display of all four elements, you can still select the space warp by clicking its gizmo, which, when viewed from the "top" (the orthogonal viewport in which the warp was created), resembles a pair of crossed double-headed arrows in the shape of an X.

Show Lattice: Displays the vector field lattice, a yellow wireframe box. The vectors are generated at lattice intersections inside the vector field range. Default=on.

Show Range: Displays the volume about the obstacle object within which vectors are generated, as an olive-colored wireframe. The range starts out the same shape and size as the obstacle object, and is typically enlarged with the Compute Vectors group > Range setting. Default=on.

Show Vector Field: Displays vectors, which appear as blue lines emanating outward from lattice intersections within the range volume. Default=off.

Show Surface Samples: Displays short green lines emanating from sample points on the surface of the obstacle object. These appear only after you've computed the vector field. See Sample Resolution for more information. Default=off.

VectorScale: Scales the vectors so they're more visible or less obtrusive. Default=1.0.

Note: This setting does not affect the strength of the vectors; only their visibility.

Icon Size: Adjusts the size of the Vector Field space warp icon, a pair of crossed double-headed arrows. Increase the size for easier viewport selection. Default=size originally drawn in viewport.

Force group

These parameters determine how the vector field affects objects within its volume.

Changing any of the Force group settings does not require that you recalculate the vector field.

Note: The vector field does not assure that delegates or particles remain at a particular distance from the obstacle. In some cases you might have to animate the Strength, Falloff, and/or Pull settings to keep delegates within the vector field.

Strength: Sets the degree of effect the vectors have on the movement of an object entering the vector field. If Show Vector Field is on as you adjust Strength, you can see the vector lines change size in the viewports in real time. Default=1.0.

Note: Sometimes, after changing strength, vectors will be too large or too small. In such cases, adjust the VectorScale parameter so that they display properly.

Falloff: Determines the rate at which the strength of the vectors falls off with distance from the surface of the object. A value of 0 will make all the vectors the same size. A value greater than 0 will make them get smaller as they get further away. A value less then 0 will make them get larger as they get further away. Default=2.0.

Parallel/Perpendicular: Sets whether the force generated by the vectors works parallel or perpendicular to the vector field. Because the vectors are perpendicular to the object surface, and you typically would want delegates to travel parallel to the surface, you would normally use a perpendicular force. Default=Perpendicular.

Pull: Adjusts objects' position relative to the field. Available only when Perpendicular is chosen. Default=0.0. Range=-1.0 to 1.0.

Objects moving perpendicular to a vector field sometimes tend to drift away from it, due to lack of subsampling. The Pull parameter helps to pull objects back. Pull values greater than 0 create a pulling force towards the source of the vector field vector. Values less than 0 pull the force towards the direction in which the vector field's vector is pointing. A value of 0.0 produces a force perfectly perpendicular to the vector field's vector.

Compute Vectors group

Vector Field Object: Lets you designate the obstacle object. Click this button, and then select the object around which the vector field is to be generated. Thereafter the object's name appears on the button.

Note: You can use only primitives and unmodified editable mesh objects as obstacles. Also, the object should be fully enclosed in the Vector Field lattice.

Range: Determines the volume within which vectors are generated. The Range is represented in viewports as an olive-colored wireframe that starts out the same size and shape as the obstacle object. Increasing the Range setting moves the wireframe away from the obstacle object in the direction of its surface normals. Default=1.0.

In crowd simulations, the Range outline is where the delegates start to "see" the obstacle object, and begin to turn to avoid it. If your crowd members are penetrating the obstacle, or even just coming too close to it before turning, increase the Range setting. Also try increasing the Vector Field lattice resolution and/or the Sample Res setting.

Sample Res(olution): Acts as a multiplier of the effective sampling rate used on the obstacle object's surface to calculate vector directions in the field. Default=1.

The basic sampling rate is determined by the program from the size of the lattice and the size of each polygon.

Use Flipped Faces: Causes flipped normals to be used during the computation of the vector field. Default=off.

By default, vectors are generated in the same direction as the obstacle object's face normals, so that assuming its face normals point outward, objects move around its exterior in a crowd simulation. However, if you want objects to remain within an object's interior, turn on Use Flipped Faces.

Tip: If you run a crowd simulation inside an object that is also being viewed from the inside, such as a room, you'll probably want the object's faces to point inward. In that case, use Editable Mesh/Edit Mesh > Surface Properties to flip the normals, and don't turn on Use Flipped Faces.

Compute: Calculates the vector field.

Always recalculate the vector field after changing any parameters except those in the Force group.

Blend Vectors group

The Blend Vectors parameters are for reducing abrupt changes in angles of neighboring vectors. For example, if you have a wavy surface, you may get wavy vectors very far out from the surface, which might adversely affect the simulation. Use Blend Vectors to correct this condition.

Start Dist: The distance from the object at which you want to start blending the vectors. Default=0.0.

Falloff: The falloff of the blend of the surrounding vectors. Default=2.0.

Blend segs X: The number of adjacent lattice points to blend on the X axis. Default=1.

Blend segs Y: The number of adjacent lattice points to blend on the Y axis. Default=1.

Blend segs Z: The number of adjacent lattice points to blend on the Z axis. Default=1.

Blend: Click this button to implement the blending.

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