[x3d-public] Viewpoint (clipBoundary); missing from X3DUOM view on iPhone via google drive

[Don Brutzman]

John, we do not have a simple example demonstrating proper use of the
Viewport node in the X3D Example Archives, and so it is difficult to test
what you are reporting.

all the best, Don
-- 
X3D Graphics, Maritime Robotics, Distributed Simulation
Relative Motion Consulting  https://RelativeMotion.info


On Sun, Jan 4, 2026 at 8:31 AM John Carlson via x3d-public <
x3d-public at web3d.org> wrote:

> One of the gotchas in adding strict mode to Ajv JSON schema validation is
> Viewport.clipBoundary:
>
> Viewport : X3DViewportNode, X3DBoundedObject {
>   MFNode  [in]     addChildren             [X3DChildNode]
>   MFNode  [in]     removeChildren          [X3DChildNode]
>   MFNode  [in,out] children       []       [X3DChildNode]
>   MFFloat [in,out] clipBoundary   0 1 0 1  [0,1]
>   SFBool  [in,out] bboxDisplay    FALSE
>   SFNode  [in,out] metadata       NULL     [X3DMetadataObject]
>   SFBool  [in,out] visible        TRUE
>   SFVec3f []       bboxCenter     0 0 0    (-∞,∞)
>   SFVec3f []       bboxSize       -1 -1 -1 [0,∞) or -1 -1 -1
> }
>
> I don’t recall if this was discussed on the mailing list before.
>
> The error reported was:
>
> strict mode: "prefixItems" is 4-tuple, but minItems or maxItems/items are not specified or different at path "#/oneOf/1/properties/%40clipBoundary"
>
>
> I don’t know if # prefixItems = 4 is appropriate here, since clipBoundary
> is an MFFloat.  I don’t know how to set a default for MFFloat without
> prefixItems.  I could set minItems = 0
>
> The JSON schema says:
>
> "@clipBoundary": {
> "$comment": "MFFloat inputOutput",
> "type": "array",
> "prefixItems": [
> {
> "default": 0,
> "maximum": 1,
> "minimum": 0,
> "type": "number"
> },
> {
> "default": 1,
> "maximum": 1,
> "minimum": 0,
> "type": "number"
> },
> {
> "default": 0,
> "maximum": 1,
> "minimum": 0,
> "type": "number"
> },
> {
> "default": 1,
> "maximum": 1,
> "minimum": 0,
> "type": "number"
> }
> ],
> "items": {
> "maximum": 1,
> "minimum": 0,
> "type": "number"
> }
> },
>
>
> X3DUOM 4.0 says:
>
> ConcreteNode name="Viewport">
> <InterfaceDefinition specificationUrl="
> https://www.web3d.org/specifications/X3Dv4/ISO-IEC19775-1v4-IS/Part01/components/layering.html#Viewport
> "
> appinfo="Viewport is a Grouping node that can contain most nodes.">
> <componentInfo name="Layering" level="1"/>
> <Inheritance baseType="X3DViewportNode"/>
> [snip]
> <field name="clipBoundary"
> type="MFFloat"
> accessType="inputOutput"
> default="0 1 0 1"
> minInclusive="0"
> maxInclusive="1"
> description="clipBoundary is specified in fractions of the normal render
> surface in the sequence left/right/bottom/top."/>
> [snip]
>
> An addition, such as min/max length, if needed, would be a welcome
> addition to X3DUOM.
>
> Also X3DUOM 4.0 XML ConcreteNode Viewport wasn’t viewable on my iPhone in
> Google drive as downloaded from web3d.org (there was no way to view the
> full XML in safari, chrome or on sourceforge or drive).  I probably could
> have downloaded from sourceforge.
>
> So I used my old copy on GitHub.
>
> John
>
>
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