API Docs Class: Terrains

new Terrains( [config] [, typeName])

Creates a new parametric terrain representation.

Parameters:

Name Type Argument Description

config

object

An optional configuration object.

Properties of `config`:

Name	Type	Argument	Description
`name`	string	<optional>	A human-readable name for this component.
`uuid`	string	<optional>	A universally unique identifier of this component.
`productRef`	string	<optional>	The product reference number or identifier..
`description`	string	<optional>	A brief product or type description.
`supplier`	BIM.Supplier	<optional>	An optional supplier details data object.

typeName

string

An additional parameter typically used by subclasses to set the component type name without modifying the config object.

Author:

drajmarsh

Extends

BIM.Component

Classes

Berm
NURBS
Noise

Members

:boolean applyGradient

Whether or not to grade the surface from zero to height, defaults to false.

Type

boolean

:boolean applyNoise

Whether or not to add random noise to surface, defaults to false.

Type

boolean

:string className <readonly>

The name of the subclass for this object instance.

This name must match the name of this class within the PD.Registry. Thus, the base implementation simply references this.constructor.getClassName() to ensure that this is always the case even for subclasses. As a result, there is rarely any need to override this method.

This property is used when copying, storing and exporting data for subclass instances to ensure that they are recreated as instances of the right class.

Type

string

Inherited From:

PD.Base#className

Overrides:

BIM.Component#className

:string description

A brief product or type description, defaults to an empty string.

This description is typically used to provide additional information about the product to other team members, such as its reasons for selection. important features, specifications and/or intended use.

Type

string

Inherited From:

BIM.Component#description

Overrides:

BIM.Component#description

:string displayName <readonly>

The name to display for this class within the user interface.

Type

string

Inherited From:

PD.Base#displayName

Overrides:

BIM.Component#displayName

:number gradientDirection

The direction of slope fall-off given CCW from the +X axis, defaults to 0deg (-X).

This is given as a mathematical angle rather than a cartesian angle as we don't want it to be confused in any way with the North offset angle, which is given CW from the +Y axis. Making it CCW from the +X axis allows it to use standard maths and makes it clear that it is a model-based angle.

Type

number

:number gridDensity

The density of sample grid cells over the surface, defaults to 15.

Type

number

:number gridPower

The power applied to the distance weighting process, defaults to 2.0.

Type

number

:number gridRadius

The radius of influence of each point in the grid, defaults to 4.0.

Type

number

:number gridVariance

The degree of uniformity in spacing of sample grid cells over the surface, defaults to 0.25.

Type

number

:string iconName <readonly>

The name of the SVG icon to associate with this object instance.

This name should match the name of the icon associated with this class within the PD.Registry. Thus, the default implementation simply references this.constructor.getClassName() to ensure that this is always the case, even for subclasses. However, you can override this property if you want a different icon dependant on other properties of the class instance, as shown in the example below.

Type

string

Inherited From:

PD.Base#iconName

Overrides:

BIM.Component#iconName

Example

// Overriding the icon name.

MyElements.Table = class extends PD.Base {
    /// ...
    get iconName() {
        if (this.hasRoundTop) return 'MyElements.Table.Round';
        return this.constructor.getClassName();
    };
    /// ...
 };

:boolean interpolateSurface

Whether to spatially interpolate a surface grid from raw spot heights.

Type

boolean

:boolean isComponent <readonly>

A flag identifying this object as a shared BIM component.

Type

boolean

Inherited From:

BIM.Component#isComponent

Overrides:

BIM.Component#isComponent

:boolean isLocked

Whether or not this component's parameters are fixed.

This property is used by the UI and framework to indicate that the component's parameters are fixed and therefore not editable. It is typically set by a 3rd-party manufacturer or supplier on products that they can only provide in one configuration.

For example, there is no point specifying a particular manufacturer's fridge and then adjusting its width to fit a hole in your cabinetry if that manufacturer cannot actually supply a fridge of that width.

Thus, when this property is true, you will not be able to edit the parameters, but you can always duplicate the component (or its configuration), but without the supplier details if you really do want to modify it.

Type

boolean

Inherited From:

BIM.Component#isLocked

Overrides:

BIM.Component#isLocked

:boolean isTerrainType <readonly>

A flag identifying this object as a terrain type.

Type

boolean

:boolean keepAspect

Whether to make the number of grid cells in the X and Y axis the same.

Type

boolean

:string name

A human-readable name for this item instance.

Type

string

Inherited From:

PD.Base#name

Overrides:

BIM.Component#name

:THREE.Vector2 noiseOffset

The noise function 2D offset factor.

Type

THREE.Vector2

:THREE.Vector3 noiseScale

The noise function 3D scale factor.

Type

THREE.Vector3

:string productRef

The product reference number or identifier, defaults to an empty string.

The product reference is typically used to store a serial number, model number, SKU or other identifier provided by the manufacturer or supplier to uniquely identify this product.

Type

string

Inherited From:

BIM.Component#productRef

Overrides:

BIM.Component#productRef

:number spotDensity

The density of the spot heights over surface, defaults to 8.

Type

number

:number subType <readonly>

An element-specific subtype.

Type

number

Inherited From:

BIM.Component#subType

Overrides:

BIM.Component#subType

:string supplier

The product supplier/manufacturer, defaults to null.

This property contains details of the supplier or manufacturer of this product or component. Multiple components can share the same supplier instance to avoid unnecessary duplication of data.

Type

string

Inherited From:

BIM.Component#supplier

Overrides:

BIM.Component#supplier

:string uuid

A universally unique identifier for the item instance.

Type

string

Inherited From:

PD.Base#uuid

Overrides:

BIM.Component#uuid

Methods

checkDynamicParameter(param, group, host)

Checks the allowable range of element parameter values.

See the PD.Base#checkDynamicParameter method for more details.

Parameters:

Name	Type	Description
`param`	PD.Parameter	The parameter that is being interactively changed.
`group`	PD.ParamGroup	The group that the dynamic parameter belongs to.
`host`	BIM.Element	The host element this component is controlling.

Inherited From:

PD.Base#checkDynamicParameter

Overrides:

BIM.Component#checkDynamicParameter

Example

checkDynamicParameter(param, group, host) {

     switch (param.name) {

         case 'height':
             if (param.value < 1.0) param.value = 1.0;
             break;

         case 'width':
         case 'length':
             if (param.value < 100.0) param.value = 100.0;
             if (this.standardBedSize > 0) { // If not custom.
                 group.setParameterValue('standardBedSize', 0);
                 this.standardBedSize = 0; // Make it custom.
             }
             break;

         case 'standardBedSize': {
                 const std_bed = this.getStandardBedSize(Math.round(param.value));
                 if (std_bed != null) {
                     const [ width, length ] = (PD.DIMENSION.useImperial) ? std_bed.sizeImperial : std_bed.sizeMetric;
                     this.width = PD.Utils.toNumber(width, this.width);
                     group.setParameterValue('width', this.width);
                     this.length = PD.Utils.toNumber(length, this.length);
                     group.setParameterValue('length', this.length);
                 }
             } break;

       }

 };

clone()

Creates a copy of this instance with different name and uuid.

Inherited From:

PD.Base#clone

Overrides:

BIM.Component#clone

Returns:

Returns a new instance with copied values.

Type: PD.Base | null

copySpotHeightsToSurfacePoints(terrain, spotHeights)

Copy spot heights to surface points with optional Perlin noise.

Parameters:

Name	Type	Description
`terrain`	BIM.Terrain	The terrain element this component is controlling.
`spotHeights`	Array.<Array.<number>>	An array of [x,y,z,u,v] spot height positions.

generateSpotHeights(terrain)

Generate the base spot heights that govern the interpolated surface.

The aim is that spot heights can be generated in a variety of different ways, such as a grid of mathematically calculated points, a set of measured points heights, lines of imported contours, etc.

Once defined, a gridded surface can be interpolated from these spot heights using a range of different algorithms, such as a inverse distance, NURBS curve fitting, or even just triangulating the raw control nodes

Each subclass can offer a different set of options for generating spot heights. This default implementation generates a flat grid of control nodes that is either horizontal or sloping in a given direction.

The return value of this method must be an array of spot heights, where each spot height is an array of five (5) numbers where the first three (3) are the absolute X, Y and Z values of the point in model coordinates, and the last two (2) are its fractional U and V coordinates relative to the X and Y extents of the terrain footprint.

The U and V coordinates are used to apply spatial undulations to the resulting surface if it is not interpolated. As such, they are actually optional as they can be computed from the X and Y positions of each point, however it does give subclasses that use UV coordinates an opportunity to provide them in order to avoid their recalculation.

The following example shows how to obtain the terrain footprint extents and how the default U and V coordinates will be computed.

Parameters:

Name	Type	Description
`terrain`	BIM.Terrain	The terrain element this component is controlling.

Returns:

Returns an array of [x,y,z,u,v] control nodes.

Type: Array.<Array.<number>>

Example

let u, v;
const extents = terrain.footprint.extents;
const spot_heights = terrain.generateSpotHeights();
const dx = Math.max(1e-6, extents.max.x - extents.min.x);
const dy = Math.max(1e-6, extents.max.y - extents.min.y);
for (const pos of spot_heights) {
    u = (pos[0] - extents.min.x) / dx;
    v = (pos[1] - extents.min.y) / dy;
    /// Apply spatial noise...
}

generateSurfacePoints(terrain)

Generate spot heights using Perlin noise over the path.

Parameters:

Name	Type	Description
`terrain`	BIM.Terrain	The terrain element this component is controlling.

getDynamicParameters(host)

Provides a list of element-based dynamic parameter groups for this element.

See the PD.Base#getDynamicParameters method for more details.

Parameters:

Name	Type	Description
`host`	BIM.Element	The host element this component is controlling.

Inherited From:

PD.Base#getDynamicParameters

Overrides:

BIM.Component#getDynamicParameters

Returns:

Returns an array of PD.ParamGroup objects.

Type: Array

Example

getDynamicParameters(host) {
     return [
         new PD.ParamGroup({
             name: 'mainParams',
             title: 'Table Parameters',
             target: this,
             params: [
                 new PD.Parameter({ name: 'height', title: 'Table Height', value: this.height, paramType: PD.ParamType.SmallDistance, description: 'The height from floor level to the top of the table.' }),
                 new PD.Parameter({ name: 'size', title: 'Table Top Size/Diameter', value: this.size, paramType: PD.ParamType.Distance, description: 'The size of the table top when not defined by a closed path.' }),
                 new PD.Parameter({ name: 'thickness', title: 'Table Top Thickness', value: this.thickness, paramType: PD.ParamType.SmallDistance, description: 'The thickness of the table top surface.' }),
                 new PD.Parameter({ name: 'offset', title: 'Offset From Path', value: this.offset, paramType: PD.ParamType.SmallDistance, description: 'The offset distance from the table path.' }),
                 new PD.Parameter({ name: 'swapSides', title: 'Swap Sides', value: this.swapSides, paramType: PD.ParamType.Boolean, description: 'Reverse the direction of the table relative to its path.' }),
                 new PD.Parameter({ name: 'isRound', title: 'Round Table', value: this.isRound, paramType: PD.ParamType.Boolean, description: 'Whether or not the table surface is round.'  }),
             ]
         }),
         new PD.ParamGroup({
             name: 'legParams',
             title: 'Leg Parameters',
             target: this,
             params: [
                 new PD.Parameter({ name: 'legCount', title: 'Number of Legs', value: this.legCount, paramType: PD.ParamType.Integer, description: 'The number of legs on the table.' }),
                 new PD.Parameter({ name: 'legSize', title: 'Leg Size', value: this.legSize, paramType: PD.ParamType.SmallDistance, description: 'The thickness of each leg of the table.' }),
                 new PD.Parameter({ name: 'legInset', title: 'Leg Edge Inset', value: this.legInset, paramType: PD.ParamType.SmallDistance, description: 'The inset distance of each leg from the table edge.' }),
                 new PD.Parameter({ name: 'legOffset', title: 'Leg Edge Offset', value: this.legOffset, paramType: PD.ParamType.Fraction, description: 'The relative distance of the leg along each edge span.' }),
                 new PD.Parameter({ name: 'legSpan', title: 'Max. Distance Between Legs', value: this.legSpan, paramType: PD.ParamType.Distance, description: 'The maximum distance between legs along each edge span.' })
             ]
         })
     ];
 };

getNameAndSupplierParameters()

Provides a list of dynamic parameter groups for the component name, description and supplier.

See the PD.Base#getDynamicParameters method for more details.

Inherited From:

BIM.Component#getNameAndSupplierParameters

Overrides:

BIM.Component#getNameAndSupplierParameters

Returns:

Returns an array of PD.ParamGroup objects.

Type: Array

hasMethod(component, methodName)

Determines if this component has a callable method with the given name.

This method is useful for checking if the component has a particular method before attempting to call it, thereby avoiding potential runtime errors. It is used within the framework to check for the presence of life-cycle methods in an element's type component before delegating them.

Parameters:

Name	Type	Description
`component`	BIM.Component	The component to check.
`methodName`	string	The case-sensitive name of the function/method to check for.

Inherited From:

BIM.Component#hasMethod

Overrides:

BIM.Component#hasMethod

Returns:

Returns true if the component is valid and has the function name as a method, otherwise false.

Type: boolean

interpolateSurfaceFromSpotHeights(terrain, spotHeights, density)

Interpolate a gridded surface over an array of spot heights.

The surface is interpolated over the extents of the terrain footprint and has optional Perlin noise applied.

Parameters:

Name	Type	Description
`terrain`	BIM.Terrain	The terrain element this component is controlling.
`spotHeights`	Array.<Array.<number>>	An array of [x,y,z,u,v] spot height positions.
`density`	number	The density of the interpolate surface grid.

isCompatibleWith(obj)

Determines if this component can be added to the given entity.

Whilst a small number of components may be compatible with multiple entity types, most components are designed to be used only by a specific entity type, and will not allow you to assign them to an incompatible entity.

Parameters:

Name	Type	Description
`obj`	BIM.ENTITY \| BIM.Entity	The entity type or object instance to check for compatibility with.

Inherited From:

BIM.Component#isCompatibleWith

Overrides:

BIM.Component#isCompatibleWith

Returns:

Returns true if the component can be added to the object, otherwise false.

Type: boolean

rebuild(terrain)

Rebuilds the terrain surface ready for visualisation.

Parameters:

Name	Type	Description
`terrain`	BIM.Terrain	The terrain element to rebuild.

Inherited From:

BIM.Terrains#rebuild

Overrides:

BIM.Component#rebuild

Returns:

Returns this terrain type to support method chaining.

Type: BIM.Chairs

updateDynamicParameters(param, group)

Sets the dynamic parameter value and returns true if it changed.

Most subclasses don't need to override this method as it automatically detects changes and rebuilds the element/component and model when required. However, if you do need to add your own custom logic or intercept the return value, please read the following examples carefully and use whichever best suits your needs.

NOTE: When overriding this method, you may not want to call super.updateDynamicParameters(param, group) as the parent class may have added its own logic that may interfere with what you want to do. Instead, either use the static PD.Base.updateDynamicParametersOnHost method to check if the value changed, or base it on the third example which replicates the code in that static method.

Parameters:

Name	Type	Description
`param`	PD.Parameter	The dynamic parameter that changed.
`group`	PD.ParamGroup	The group that the dynamic parameter belongs to.

Inherited From:

PD.Base#updateDynamicParameters

Overrides:

BIM.Component#updateDynamicParameters

Returns:

Returns true if the value actually changed.

Type: boolean

Examples

updateDynamicParameters(param, group) {

     /// When you want parent class to use its logic.
     if (super.updateDynamicParameters(param, group)) {
         if (param.name == 'i_am_special') this.doSomethingSpecial();
         return true;
     }

     return false;

 };

updateDynamicParameters(param, group) {

     /// When you don't want parent to handle parameter updates.
     if (PD.Base.updateDynamicParametersOnHost(param, group, this)) {

         /// Invalidate geometry.
         if (this.typeComponent) {
             ++this.typeComponent.updateIndex;
         }

         /// Rebuild element.
         this.hasChanged = true;
         this.update();

         /// Only update site mesh.
         if (this.onlyUsesSiteMesh) {
             const level = this.level;
             if (level) { // Don't trigger whole level update.
                 level.rebuildSiteMesh();
                 PD.GlobalActions.redrawAndUpdateSelection();
                 return false;
             }
         }

         return true;

     }

     return false;

 };

updateDynamicParameters(param, group) {

     /// The following three lines of code replicate
     /// `PD.Base.updateDynamicParametersOnHost()`, which you can
     /// use if you need to access `target` without having to call
     /// `group.getTarget() || this` twice.

     const target = group.getTarget() || this;
     target.checkDynamicParameter(param, group, this);
     if (param.setValueOnHostIfDifferent(target, group, this)) {

         /// You can now use `target`.
         if (target.myOwnMeshThatIsUpdatedDuringRebuild) {

             /// Rebuild element.
             this.hasChanged = true;
             this.update();

             /// If no level meshes or other elements are affected,
             /// simply update the target locally and return false.
             this.myOwnMeshThatIsUpdatedDuringRebuild.update();

             /// Update selection meshes if the
             /// element's highlight geometry changed.
             PD.GlobalActions.updateSelectionMeshes();
             return false;

         }

         return true;

     }

     return false;

 };

getClassDescription() <static>

A brief description of this class to accompany its icon.

Returns:

Returns a brief description.

Type: string

getClassName() <static>

The name of this class within the PD.Registry.

See PD.Base.getClassName for more details as this is required for use with the PD.Registry.

Returns:

Returns the registered name of this class.

Type: string

getDisplayName() <static>

The name to display within the user interface.

Returns:

Returns the display name.

Type: string

getHostElementClass() <static>

Retrieves the class of the host element for this component.

See BIM.Component#getHostElementClass for more details on this static method.

Returns:

Returns the element class this component requires as a host.

Type: BIM.Chair

isCompatibleWith(obj) <static>

Determines if this component can be added to the given object.

Parameters:

Name	Type	Description
`obj`	BIM.ENTITY \| BIM.Entity	The entity type or object to check for compatibility with.

Returns:

Returns true if the component can be added to the object, otherwise false.

Type: boolean

subType() <static>

Retrieves the sub-type of terrain that this class represents.

See BIM.Component#subType for more details on this static method.

Returns:

Returns the sub-type enumerator of this class.

Type: BIM.CHAIR

Class: Terrains

new Terrains( [config] [, typeName])

Parameters:

Properties of config:

Extends

Classes

Members

applyGradient

Type

applyNoise

Type

className <readonly>

Type

description

Type

displayName <readonly>

Type

gradientDirection

Type

gridDensity

Type

gridPower

Type

gridRadius

Type

gridVariance

Type

iconName <readonly>

Type

Example

interpolateSurface

Type

isComponent <readonly>

Type

isLocked

Type

isTerrainType <readonly>

Type

keepAspect

Type

name

Type

noiseOffset

Type

noiseScale

Type

productRef

Type

spotDensity

Type

subType <readonly>

Type

supplier

Type

uuid

Type

Methods

checkDynamicParameter(param, group, host)

Parameters:

Example

clone()

Returns:

copySpotHeightsToSurfacePoints(terrain, spotHeights)

Parameters:

generateSpotHeights(terrain)

Parameters:

Returns:

Example

generateSurfacePoints(terrain)

Parameters:

getDynamicParameters(host)

Parameters:

Returns:

Example

getNameAndSupplierParameters()

Returns:

hasMethod(component, methodName)

Parameters:

Returns:

interpolateSurfaceFromSpotHeights(terrain, spotHeights, density)

Properties of `config`: