Comments (10)
create3000
commented on July 3, 2024
Prototype can only be created using declarative syntax, they are not made to be created per scripting. You would create a function which returns one or more nodes, which is almost what a prototype does.
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Wagyx
commented on July 3, 2024
Okay, what about InstancedShape ? I would like to display thousands of spheres and cylinders in the scene with a specific transform for each. For now, I am creating thousands of shapes making the browser slow to load and decreasing the framerate.
What if I use fromXmlString to load a node ?
I could also create the geometry for one sphere myself and duplicate and merge them into a large TriangleSet.
I'll be trying these solutions today, will report back on what works. If you have other ideas about what might work, please let me know.
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create3000
commented on July 3, 2024
InstancedShape is made for this task. Of course you can use Browser.createX3DFromString to load a data with a protoype.
const scene = await browser .createX3DFromString (`PROTO Foo [
# fields come here
]
{
# Body comes here
}`);
// Now create an instance:
const instance = scene .createProto ("Foo");from x_ite.
Wagyx
commented on July 3, 2024
Okay, I have tried the InstancedShape in a simple X3D scene. No JS is involved.
I noticed that you need to add a header with a X_ITE component before the Scene tag like so:
<head>
<component name='X_ITE' level='1'/>
</head>Otherwise I get the following error in the Chrome browser and the Shape does not display
XML Parser: Unknown node type 'InstancedShape', you probably have insufficient component/profile statements and/or an inappropriate specification version.
I am just putting this here in case it helps other people.
I guess the InstancedShape is not standard X3D and I missed the place in the doc where this component stuff was indicated.
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Wagyx
commented on July 3, 2024
Found it in the InstancedShape description ...
Just need to find how to tell the browser to use this component with JS now.
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Wagyx
commented on July 3, 2024
This works for modifying the header
const comp = xBrowser.getComponent ("X_ITE", 1);
scene.addComponent(comp);But I still get Unknown node type 'InstancedShape' when creating the node const instShape = scene.createNode("InstancedShape");
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create3000
commented on July 3, 2024
const scene = await browser .createX3DFromString (`
COMPONENT X_ITE : 1
PROTO Foo [
# fields come here
]
{
# Body comes here
}`);
// Now create an instance:
const instance = scene .createProto ("Foo");Add a component statement like the above.
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create3000
commented on July 3, 2024
If you do it in the parser, you must first load the components:
scene .addComponent (browser .getComponent (componentName));
this .loadComponents () .then (() =>
{
this .resolve (scene);
})
.catch (this .reject);Where loadComponents is defined in X3DParser.
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Wagyx
commented on July 3, 2024
Thank you very much, that did the trick !
Is there a way to change the color of each instance ? Defining a color array in the material perhaps ? or having a colors property in the instancedShape like the rotations would be pretty neat.
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create3000
commented on July 3, 2024
No this is not possible. If you have only a few colors, you could create a InstancedShape node for every color, otherwise you can create one big geometry with all faces and colors.
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