BIMServerLoaderPlugin not rendering geometries properly

[xeokit]

BIMServerLoaderPlugin not rendering geometries properly

[xeolabs]

@sha-N yes I'll add an option to BIMServerLoader - see #22

[sha-N]

Side note

BIMSURFER2 which is based on SceneJS renders the above model as follows

and in BIMSURFER3 when quantization is disabled, it also behaves in a similar fashion.

[sha-N]

@xeolabs can you provide some pointers on where to start for resolving this, I just got started on this whole bimserver stuff a week back, trying to catch up on what is available and how is it done.

[xeolabs]

This is a quantization accuracy error, which is not an error within xeokit as such. It is caused by your floating-point geometry losing accuracy when xeokit internally quantizes it to integers. Two things you can try:

• increasing or decreasing the scale of your model
• ensuring that your model is centered at [0,0,0]

For example:

var model = bimServerLoader.load({
    //..
    scale: [0.5, 0.5, 0.5],    
    position: [-90, 0, 0] 
});

[sha-N]

Thank you for the reply, I had tried changing the scale with no luck.

can internal quantization be disabled once, *** Download quantized geometry from BIMServer - in progress** is done

[xeolabs]

No, quantization can't be disabled. Are you able to share your IFC file, or any IFC file that reproduces this issue for you? Then I can investigate ways to make quantization more robust.

[sha-N]

Yes, I will send you the link in mail, shall i send to this id [email protected] ?

Please check of a solution as this SDK is kind of a perfect solution for the problem Im trying to solve.

[xeolabs]

Yes, please send to that email, thanks.

[sha-N]

Hi, were you able to reproduce the issue

[sha-N]

Hi, Solved the issue as per your comment by setting the position: parameter.

Right now it is kind of a workaround,

• load the model at position [0, 0, 0]
• get initial camera position
• use inverse of these coordinates on next load as position.

Update

If anybody else face similar issue

Position information can be retrieved from bimserver using ServiceInterface method: "getModelMinBounds" and multiply the coordinates with value of scale

@xeolabs is it possible to avoid the step.