Class TShape

Constructor.

Parameters

ParentInfo

Recursive information about parents, for the geometry node of given shape. Note that for VRML 2.0/X3D, the immediate parent of geometry node is always TShapeNode.

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Geometry of this shape. This may come from initial VRML/X3D node graph (see OriginalGeometry), or it may be processed by TAbstractGeometryNode.Proxy for easier handling.

State of this shape. This may come from initial VRML/X3D node graph (see OriginalState), or it may be processed by TAbstractGeometryNode.Proxy for easier handling.

Owned by this TShape class.

Bounding box in local shape coordinates, i.e. disregarging all transformations (any TTransformNode, TCastleTransform) done on top of shape.

Bounding box in scene coordinates, i.e. in the local coordinates of TCastleSceneCore that owns this shape.

The idea is that TCastleSceneCore.LocalBoundingBox is calculated just by summing up the Shape.BoundingBox for each shape. So transformations done using TTransformNode are accounted here. Parent TCastleTransform are not accounted here.

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Warning: this symbol is deprecated: use VerticesCount without Boolean argument, it is ignored now

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Warning: this symbol is deprecated: use TrianglesCount without Boolean argument, it is ignored now

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Decompose the geometry into primitives, with arrays of per-vertex data.

Calculates bounding sphere based on BoundingBox. In the future this may be changed to use BoundingSphere method of TAbstractGeometryNode, when I will implement it. For now, BoundingSphere is always worse approximation of bounding volume than BoundingBox (i.e. BoundingSphere is always larger) but it may be useful in some cases when detecting collision versus bounding sphere is much faster than detecting them versus bounding box.

BoundingSphereRadiusSqr = 0 and BoundingSphereCenter is undefined if Box is empty.

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Exactly equivalent to getting BoundingSphereCenter and BoundingSphereRadiusSqr and then using TFrustum.SphereCollisionPossible.

But it may be a little faster since it avoids some small speed problems (like copying memory contents when you get values of BoundingSphereXxx properties and checking twice are BoundingSphereXxx calculated).

Exactly equivalent to getting BoundingSphereCenter and BoundingSphereRadiusSqr and then using TFrustum.SphereCollisionPossibleSimple.

But it may be a little faster since it avoids some small speed problems.

Notify this shape that you changed a field inside one of it's nodes (automatically done by TCastleSceneCore). This should be called when fields within Shape.Geometry, Shape.State.Last*, Shape.State.ShapeNode or such change.

Pass InactiveOnly = True is you know that this shape is fully in inactive X3D graph part (inactive Switch, LOD etc. children).

Including chTransform in Changes means something more than general chTransform (which means that transformation of children changed, which implicates many things — not only shape changes). Here, chTransform in Changes means that only the transformation of TShape.State changed (so only on fields ignored by EqualsNoTransform).

The dynamic octree containing all triangles. It contains only triangles within this shape.

There is no distinction here between collidable / visible (as for TCastleSceneCore octrees), since only the whole shape may be marked as visible and/or collidable, not particular triangles.

The triangles are specified in local coordinate system of this shape (that is, they are independent from transformation within State.Transform). This allows the tree to remain unmodified when transformation of this shape changes.

This is automatically managed (initialized, updated, and used) by parent TCastleSceneCore. You usually don't need to know about this octree from outside.

To initialize this, add ssTriangles to InternalSpatial property, otherwise it's Nil. Parent TCastleSceneCore will take care of this (when parent TCastleSceneCore.PreciseCollisions = True (that is when TCastleSceneCore.Spatial contains ssDynamicCollisions) then all shapes contain ssTriangles within their InternalSpatial).

Parent TCastleSceneCore will take care to keep this octree always updated.

Parent TCastleSceneCore will also take care of actually using this octree: TCastleSceneCore.OctreeCollisions methods actually use the octrees of specific shapes at the bottom.

Properties of created triangle octrees. See TriangleOctree unit comments for description.

Default value comes from DefLocalTriangleOctreeLimits.

They are used only when the octree is created, so usually you want to set them right before changing InternalSpatial from [] to something else.

How should the alpha of the resulting calculation be used. Should we use alpha blending (partial transparency), or alpha test (yes-or-no transparency) or none of it (shape is simply opaque).

This is determined looking at the TAppearanceNode.AlphaChannel field. By default, it is acAuto, which in turn means that the final value of this method (which cannot be acAuto) is calculated looking at material, color, texture nodes data (including at texture images contents).

Warning: this symbol is deprecated: use "AlphaChannel = acBlending"

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Warning: this symbol is deprecated: use "AlphaChannel = acBlending"

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Is the shape visible. Most shapes are visible, except when placed in TCollisionNode.Proxy (which allows to define invisible shapes, only for collision purposes).

Is the shape collidable. Most shapes are collidable. One exception is when TAbstractShapeNode.Collision is set to scNone, which disables collisions. Another exception is when the shape is placed inside TCollisionNode children, and then you use TCollisionNode.Enabled to turn off collisions, or TCollisionNode.Proxy to provide alternative geometry for collisions.

Equivalent to using OctreeTriangles.RayCollision, except this wil use the mailbox.

Equivalent to using OctreeTriangles.SegmentCollision, except this wil use the mailbox.

Create normals suitable for this shape.

You can call this only when Geometry is coordinate-based X3D geometry, implementing Coord and having non-empty coordinates (that is, Geometry.Coord returns True and sets ACoord <> Nil), and having Geometry.CoordIndex <> Nil.

For NormalsSmooth, also Geometry.CoordIndex = Nil is allowed, but make sure that Geometry.InternalCoordPolygons is available. See CreateSmoothNormalsCoordinateNode.

• Smooth normals are perfectly smooth, per-vertex.

  As an exception, you can call this even when coords are currently empty (Geometry.Coord returns True but ACoord is Nil), then result is also Nil.

• Flat normals are per-face. Calculated by CreateFlatNormals.

• Finally NormalsCreaseAngle creates separate normal per index (auto-smoothing by CreaseAngle).

The normals here are cached. So using these methods makes condiderable speedup if the shape will not change (Changed method) and will need normals many times (e.g. will be rendered many times).

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This item has no description. Showing description inherited from TShapeTree.EnumerateTextures.

Enumerate all single texture nodes (possibly) used by the shapes. This looks into all shapes (not only active, so e.g. it looks into all Switch/LOD children, not only the chosen one). This checks all possible ways how a texture may be used by a shape, so it looks at material fields, shaders (ComposedShader, CommonSurfaceShader) and more.

If Enumerate callbacks returns non-nil for some texture, returns it immediately, and stops further processing.

Is the texture node Node possibly used by this shape. This is equivalent to checking does EnumerateShapeTextures return this shape.

Check is shape a shadow caster. Looks at Shape's Appearance.shadowCaster field (see https://castle-engine.io/x3d_extensions.php#section_ext_shadow_caster).

Triangulate shape. Calls TriangleEvent callback for each triangle. LocalTriangulate returns coordinates in local shape transformation (that is, not transformed by State.Transform yet).

Parameters

FrontFaceAlwaysCcw

This parameter determines what is the "front" face of the generated triangles. This "front" face matters e.g.

• In case the shape uses backface-culling, when TAbstractGeometryNode.Solid. In case of some model formats, like STL, the backface-culling is always "on".

• In case we use TCastleMeshCollider with TCastleMeshCollider.DoubleSided = False.

When FrontFaceAlwaysCcw is False (default), the order of the vertexes of each triangle follows the order in polygons in the original geometry.

When FrontFaceAlwaysCcw is True (default), triangles are generated such that the front face is always CCW (looks counter-clockwise from the outside).

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This item has no description. Showing description inherited from TShapeTree.DebugInfoWithoutChildren.

Describe this shape, not recursively.

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Shape node in X3D graph. This is always non-nil for X3D, VRML 2 and all model formats that are imported as X3D, like glTF, Spine, sprite sheets and more. This is Nil only for old VRML 1.0 and Inventor model formats.

Warning: this symbol is deprecated: use GeometryParentNode.X3DName, if GeometryParentNode <> nil

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Warning: this symbol is deprecated: use GeometryGrandParentNode.X3DName, if GeometryGrandParentNode <> nil

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Warning: this symbol is deprecated: use GeometryGrandGrandParentNode.X3DName, if GeometryGrandGrandParentNode <> nil

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Original geometry node, that you get from a VRML/X3D graph.

Original state, that you get from a VRML/X3D graph.

Which spatial structrues (octrees, for now) should be created and managed. This works analogous to TCastleSceneCore.Spatial, but this manages octrees within this TShape.

Parent TCastleSceneCore will take care to keep this value updated, you should only set TCastleSceneCore.Spatial from the outside.

Local geometry changes very often (like every frame). This is automatically detected and set to True. May be used as an optimization hint.

Parent, grand-parent, grand-grand-parent nodes determined during traversing of the X3D node graph.

Note that GeometryParentNode is almost always equal to Node, for X3D, VRML 2 and all model formats that are imported as X3D, like glTF, Spine, sprite sheets and more. That's because in VRML 2 and X3D, parent of geometry node must be a TShapeNode.

Only in old VRML 1.0 and Inventor model formats the GeometryParentNode may be different than Node.

All these nodes (GeometryParentNode, GeometryGrandParentNode and GeometryGrandGrandParentNode) may be useful if you need to take a different action depending on the parent nodes of this shape.

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