Class TShape

Values

• ncSmooth
• ncFlat
• ncCreaseAngle

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.

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.

Calculate bounding box and vertices/triangles count, see TAbstractGeometryNode methods.

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.

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.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"

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

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).

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).

OverTriangulate determines if we should make more triangles for Gouraud shading. For example, it makes Cones and Cylinders divided into additional stacks.

Shape node in VRML/X3D graph. This is always present for VRML >= 2 (including X3D). For VRML 1.0 and Inventor this is Nil.

Material property associated with this shape's material/texture.

Warning: this symbol is deprecated: use InternalMaterialProperty, or (better) do not use it at all -- this is internal

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.

If TriangleOctreeProgressTitle <> '', it will be shown during octree creation (through TProgress.Title). Will be shown only if progress is not active already (so we avoid starting "progress bar within progress bar").

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

Node names of parents of the geometry node. Note that for X3D/VRML 2.0, GeometryParentNodeName is the same as Node.NodeName, because the parent of geometry node is always a TShapeNode.