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{
Copyright 2010-2017 Michalis Kamburelis.
This file is part of "Castle Game Engine".
"Castle Game Engine" is free software; see the file COPYING.txt,
included in this distribution, for details about the copyright.
"Castle Game Engine" is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
----------------------------------------------------------------------------
}
{ Simple example how to build a 3D object (which is equivalent to
VRML/X3D nodes graph) by pure ObjectPascal code.
Check out latest X3D specification,
http://www.web3d.org/x3d/specifications/ISO-IEC-19775-1.2-X3D-AbstractSpecification/index.html,
and our
http://castle-engine.sourceforge.net/x3d_implementation_status.php
for a complete list of supported VRML/X3D nodes. }
uses SysUtils, CastleVectors, X3DNodes;
var
Root: TX3DRootNode;
Sphere: TSphereNode;
SphereShape: TShapeNode;
IndexedFaceSetCoordinate: TCoordinateNode;
IndexedFaceSet: TIndexedFaceSetNode;
IndexedFaceSetShape: TShapeNode;
IndexedFaceSetShapeTranslated: TTransformNode;
Appearance: TAppearanceNode;
begin
{ This will be used as appearance for both sphere and IndexedFaceSet }
Appearance := TAppearanceNode.Create;
Appearance.Material := TMaterialNode.Create;
Sphere := TSphereNode.Create;
Sphere.Radius := 2;
SphereShape := TShapeNode.Create;
SphereShape.Appearance := Appearance;
SphereShape.Geometry := Sphere;
IndexedFaceSetCoordinate := TCoordinateNode.Create;
IndexedFaceSetCoordinate.SetPoint([
Vector3(0, 0, 0),
Vector3(1, 0, 0),
Vector3(1, 1, 0),
Vector3(0, 1, 0),
Vector3(0, 0, 0.5),
Vector3(1, 0, 0.5),
Vector3(1, 1, 0.5),
Vector3(0, 1, 0.5)
]);
IndexedFaceSet := TIndexedFaceSetNode.Create;
IndexedFaceSet.SetCoordIndex(
{ Two quad faces. These are just indexes for
the array placed in IndexedFaceSetCoordinate.SetPoint . }
[0, 1, 2, 3, 0, -1, 4, 5, 6, 7, 4]);
IndexedFaceSet.Coord := IndexedFaceSetCoordinate;
IndexedFaceSetShape := TShapeNode.Create;
IndexedFaceSetShape.Appearance := Appearance;
IndexedFaceSetShape.Geometry := IndexedFaceSet;
IndexedFaceSetShapeTranslated := TTransformNode.Create;
IndexedFaceSetShapeTranslated.Translation := Vector3(2, 0, 0);
IndexedFaceSetShapeTranslated.AddChildren(IndexedFaceSetShape);
Root := TX3DRootNode.Create;
try
Root.AddChildren(SphereShape);
Root.AddChildren(IndexedFaceSetShapeTranslated);
{ The Root holds now a tree of your VRML/X3D nodes, thus describing
your 3D object. You can do whatever you want with it:
example line below trivially saves Root to VRML/X3D file
(that can be later loaded by our engine). }
Save3D(Root, 'test.x3d', 'build_3d_object_by_code');
{ You also could create a TCastleSceneCore, or even TCastleScene
to render this 3D object directly in OpenGL (without saving to any
file). For example in scene_manager_basic.lpr you could replace
Scene.Load(ApplicationData('boxes.x3dv'));
with
Scene.Load(Root, false);
to render your constructed 3D object.
Note that you can even rebuild and change the 3D object *after*
it's already loaded and rendered by TCastleScene.
See demos animate_3d_model_by_code.lpr and animate_3d_model_by_code_2.lpr. }
finally FreeAndNil(Root) end;
end.
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