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Batched Leaf Generator
The Batched Leaf generator creates leaves in almost exactly the same manner as Leaf Mesh generators with one major exception: the results cannot be node edited. Batched Leaf generators flood the model with leaves in an optimized fashion. They are orders of magnitude faster than leaf meshes but can be controlled only as a group.
Note: geometry created by Batched Leaf generators cannot be node edited and does not participate in the dynamic LOD system or the growth system.
Generation
The properties in this group control how many leaves are generated and where they are placed.
Forces
This properties in this group control how forces affect the nodes created by this generator. Forces affect only the orientation, not the position, of leaf meshes.
Allow Forces
When enabled, all forces that are checked will act on the generator.
Forces
Each force in the scene has an entry here. Check the box next to the name to enable the force for this generator. The value set here is multiplied by the strength of the force before being applied to the branch. The profile curve controls have no effect on leaves.
Note: Click on the force name to edit the force's properties.
Random Seeds
Properties that have variance are given random values based on a seed value in this group. Vary the seeds in this group to randomize only the properties associated with the seed type.
Randomize All
Randomizes the value for all seeds used to compute this generator.
Leaves
The properties in this group control the type, size, and initial placement of the leaf nodes.
Size
This property sets the size of the leaf nodes. By default, mesh assets are treated as unit meshes and then scaled by this amount when placed on the model.
Use Actual Size
When enabled, the size parameter is ignored and the mesh is used at exactly the size at which it was modeled.
Flip
When enabled, randomly selected leaf nodes are flipped over the Y-axis.
Weld
When enabled, leaves will be placed directly on the skin of their parent (as opposed to being anchored on their spine).
Cross
When enabled, leaves are rotated so that they are perpendicular to the original leaf placement. This is a shortcut for creating crossed, intersecting meshes that have the same position.
Fix Winding
When enabled, the face winding of the polygons in the final mesh is adjusted to match the direction of the surface normals. This correction is applied after vertex deformation and lighting adjustments.
Type
The properties in this group specify the materials and meshes for the leaf. Meshes must be assigned to the material on the Material Bar to be used on the leaf. Materials are chosen based on their weights and season settings.
Material
This property specifies a named material from the Material Bar. If “None” is selected or the chosen material has no assigned mesh, a simple square will be used as placeholder geometry.
Weight
Sets the probability that a node will receive this material index (this weight ÷ sum of all weights).
Resolution
The properties in this group influence the resolution of the mesh.
Size Increase %
This curve controls the increase in the size of the leaf nodes as the resolution changes. It is often desirable to increase the size of the leaves at lower resolutions to make up for a lower number of leaves.
Mesh LOD
This curve sets which mesh version (High, Medium or Low) is used based on the active resolution. It is often desirable to use lower quality meshes at lower resolutions.
Mesh LOD offset
When set to a value other than '0', the mesh currently assigned will go up or down a mesh resolution (High, Medium, or Low). Use this property (especially in conjunction with its parent curve) to adjust mesh resolution throughout the model.
Note: “Mesh LOD” and “Mesh LOD offset” both require meshes assigned in at least two of the three mesh asset LOD slots.
Local Orientation
The properties in this group are the first stage of orienting the leaf. The orientation actions are performed in the order in which the properties are listed.
3D anchor style
Set how 3D anchors align with the orientation of the parent node.
Property | Description |
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Legacy | Ignore the orientation and deformations of the parent node. Use this setting if the parent node is a leaf and the parent orientation should be ignored. |
Match parent | Follow the orientation and deformations of the parent node. |
Unification
Uses the anchor to orient itself “out” before the rest of the orientation adjustments are performed. The “Out” direction is considered to be the vector from the anchor point through the node's attachment point. Options for setting the anchor point are as follows:
Property | Description |
---|---|
Global | The anchor point is located where the node's highest ancestor hits the ground. |
Deep | The anchor point is the base of a node very near (and sometimes exactly on) the root of the node's ancestors. |
Intermediate | The anchor point is somewhere in the middle of the node's ancestors. |
Local | The anchor point is very near where the node is attached. |
None | No anchor point is computed, and no unification is done. |
Sky Influence
Controls how much the leaves point toward the sky. Higher numbers result in the Z axis of each mesh pointing straight up.
Fold
Rotates leaves up or down around the parent's growth direction.
Align
Rotates the tip of the leaves toward or away from the parent's growth direction. Use this property to point leaves in the direction the parent is growing.
Face
Spins the leaves around their “stem” so that their “up” vector points in the direction of the parent's growth. Use this property to make the leaves face out relative to their parent.
Note: Interval and Phyllotaxy generation modes work best with these properties. These modes give each leaf an idea of which side they're on. Doing so makes a positive value for “Align,” “Face,” and “Fold” all work the same, regardless where the leaf was generated.
Sensitivity
The properties in this group control the second stage of leaf orientation.
Parent
Parent sensitivity refers to orienting the leaf based on where it is positioned relative to its ancestors.
Amount
Determines the amount that the bottom of the leaf is turned to face the point set by Anchor.
Anchor
This property picks a spot on one of the leaf's ancestors, depending on which of the following options is selected:
Property | Description |
---|---|
Global | The anchor point is located where the node's highest ancestor hits the ground. |
Deep | The anchor point is the base of a node very near (and sometimes exactly on) the root of the node's ancestors. |
Intermediate | The anchor point is somewhere in the middle of the node's ancestors. |
Local | The anchor point is very near where the node is attached. |
None | No anchor point is computed, and no parent sensitivity is added. |
Sky
Rotates the mesh around its central axis to get its Z axis as close to up as it can. Think of it as the leaves rotating around their stem to face the light.
Final Adjustments
These edits are applied to the leaf meshes as a group after Local Orientation and Sensitivity are computed.
Up
Rotates each mesh around its local X axis.
Right
Rotates each mesh around its local Y axis.
Out
Rotates each mesh around its local Z axis.
Deformation
The properties in this group alter the shape of the leaf mesh. It is important to remember that these properties work best when there are enough vertices in the mesh to reveal the changes.
Note: Using these properties on low-resolution meshes can produce undesirable results. You should always have at least one vertex near the center of the mesh for the best results.
Fold
Folds both sides of the leaf, lengthwise along the Y-axis of the mesh. A negative value bends down, while a positive value bends up.
Curl
Curls the leaf around the mesh's X-axis.
Twist
Twists the leaf around the mesh's Y-axis. The farther away a vertex is from the X-axis, the more it is rotated.
Vertex
The properties in this group perform a noise-based deformation of each vertex in the mesh.
Amount
This property controls the amount of noise applied to each vertex.
Noise
This value controls the tightness of the noise pattern. Higher values result in more localized deformations.
Seed
Vary this parameter to randomize the noise pattern.
Scale
The properties in this group scale the mesh. The scale is performed in each leaf's local orientation.
X
Scales the mesh by this amount in the X-axis.
Y
Scales the mesh by this amount in the Y-axis.
Z
Scales the mesh by this amount in the Z-axis.
Lighting
The properties in this group modify the vertex normals to change the lighting behavior of the mesh.
Note: These properties are not typically necessary for high detail VFX models but they can significantly improve the lighting on meshes that represent clusters of leaves in real-time models.
Smooth
Use this property to compute smooth normals based on the average face normals at each vertex after the deformations have been computed. A value of zero means no smoothing, a value of 1.0 means completely smoothed normals. The other lighting adjustments in this group are applied after smoothing.
Parent Puffiness
Amount
Value scale that controls how much the normals on each individual leaf should face “out,” depending on the assigned anchor point. A value of 1.0 makes each normal line up with the vector that goes from the anchor through the vertex.
Note: Click on a leaf with hints on to see the “Parent puffiness” vectors.
Anchor
This property picks a spot on one of the leaf's ancestors according to the following options.
Global | The anchor point is located where the node's highest ancestor hits the ground. |
---|---|
Deep | The anchor point is the base of a node very near (and sometimes exactly on) the root of the node's ancestors. |
Intermediate | The anchor point is somewhere in the middle of the node's ancestors. |
Local | The anchor point is very near where the node is attached. |
None | No anchor point is computed, and no parent puffiness is added. |
Puffiness
After all normal adjustments have been performed, this value “sphere-izes” the normals around the center of the mesh, making the geometry have a more puffy appearance.
Unify
This property causes all vertex normals to point in the average direction of all of the vertex normals. Use this property to align the normals to help localize specular effects.
Adjustments
The properties in this group rotate the normals of each leaf without rotating the geometry. These properties are commonly used when creating clusters.
Hint: Apply variance to these properties to make leaves in a cluster appear jumbled when lit in the final model.
Up
This property rotates vertex normals around the local X axis.
Right
This property rotates vertex normals around the local Y axis.
Out
This property rotates vertex normals around the local Z axis.
Wind
The properties in this group influence how leaves are animated in wind simulations.
Scalar
Use this property to scale how much the leaf moves during wind simulations. The amount and frequency of motion are set on the Fan object. The left-hand side of the profile curve corresponds to the pivot point. The right-hand side corresponds to the vertex farthest away.
Note: The left-hand side of the profile curve must be zero to avoid disconnecting from the parent.
Group
In many wind styles, multiple wind groups are available. Use this property to specify which group the leaves belong to. The most common use of this feature is to have separate animation parameters for leaves and fruit.
Seed
Vary this parameter to randomize wind characteristics.
Season
The properties in this group control how leaves transition in the Seasons system.
Start offset
Leaf transitions are determined by looking up season curves based on the position of the season slider. This value provides an offset on that curve lookup. Use variance on this property to randomly shift when neighboring leaves begin their transition.
Time scale
Scales how fast time passes relative to a single leaf. Higher values make leaves transition faster.
Drop time
Controls how long the leaf will remain attached. A leaf can drop no matter what material is assigned.
Droop
Use this value to make leaves droop as they transition.
Curl
Use this value to make leaves curl as they transition.
Fold
Use this value to make leaves fold as they transition.
Fallen
When “Show Dropped Leaves” is checked on the Season Slider, the properties in this group influence the behavior of leaves on the ground (or ground mesh).
Ground Duration
Sets the amount of time the leaves stay on the ground before disappearing.
Spread
This value controls how far from the point directly under the tree the leaf may travel before hitting the ground.
Flatten
Sets the amount of deformation removal (“Season:Curl” and “Season:Fold”) applied to the fallen leaves.
Jumble
Randomizes the orientations of leaves on the ground.
Slope limit
If you have a force mesh applied to the leaf generator, fallen leaves will adhere to it instead of the ground. In that circumstance, use this property to keep leaves from gathering on slopes.
Collision
The properties in this group influence how leaves in this generator interact with the Collision system.
Style
Use this property to set how the leaves behave during collision computations with the following options:
Everything | Leaves in this generator collide with each other and all other leaves. |
---|---|
Ignore Siblings | Leaves in this generator ignore siblings but collide with everything else. |
Knock out others only | Leaves in this generator cannot be removed, but they can eliminate leaves in other generators. |
Nothing | These leaves do not participate in collision computations. |
Take parent
When enabled, if a leaf in this generator is removed, its parent is also removed. Use this option to take away twigs supporting leaves that are removed.
Weight
When leaves collide, the one with the higher weight wins. Use this property to set the weight.
Pivot Threshold
This property sets how far away from the pivot (as a percentage of size) a collision has to happen in order to count. Use this property to eliminate unwanted removals of leaves anchored near each other.
Sphere Threshold
When using spherical leaf collision tests, this value scales the size of the spheres used during the test. Spheres are initially sized based on leaf size.
Vertex Color
The properties in this group control how vertex colors are computed.
Note: “Vertex colors” must be enabled on the Tree generator for these properties to work.
Red
The properties in this group control how the red component of the color is computed.
Style
This property controls how the red portion of the color is computed from the following options:
Set | Sets the color directly using the “Value” property (parent colors are ignored). |
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Offset from parent | The “Value” property is added to the vertex color inherited from the parent. |
Value
This property adds to, subtracts from, or directly sets this color component.
Green
The properties in this group control how the red component of the color is computed.
Style
This property controls how the red portion of the color is computed from the following options:
Set | Sets the color directly using the “Value” property (parent colors are ignored). |
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Offset from parent | The “Value” property is added to the vertex color inherited from the parent. |
Value
This property adds to, subtracts from, or directly sets this color component.
Blue
The properties in this group control how the red component of the color is computed.
Style
This property controls how the red portion of the color is computed from the following options:
Set | Sets the color directly using the “Value” property (parent colors are ignored). |
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Offset from parent | The “Value” property is added to the vertex color inherited from the parent. |
Value
This property adds to, subtracts from, or directly sets this color component.
Mesh Asset
The properties in this group control how vertex colors stored in the mesh asset are combined with the computed vertex colors.
Style
This property controls how mesh asset vertex colors are used from the following options:
Interpolate | The “Contribution” value is used to blend from the computed to color (0.0) to the color stored in the asset (1.0). |
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Add | The “Contribution” value is used to scale the mesh asset vertex color and the result is added to the computed vertex color. |
Contribution
This value sets how much influence the mesh asset vertex color has on the final vertex color.
Lightmap
The property in this group affects the influence leaves in this generator have on the Lightmap.
Note: Not all versions of the Modeler support lightmap UV computation.
Weight
Use this property to increase or decrease the importance of the leaves in the lightmap of this generator – in relation to the lightmap weight of all other objects – before lightmap packing is determined. Note that your Weight value may not be honored exactly or may get so large as to exhibit unexpected results. Use “Tools→Reset lightmap scalars” to go back to default values for the whole model.