Support Per-Style Geometries

[schmidtk]

OL3 #3010 added a geometry field on ol.style.Style. This allows rendering multiple geometries on a single feature by creating a style array with different geometries specified in each style. ol3-cesium should support this by creating a Cesium primitive for each style geometry instead of relying on ol.Feature#getGeometry.

[gberaudo]

There is no support for style arrays in ol3-cesium.
They are mainly used for 2D composition, which would not work in 3D.

[ahocevar]

I think it would be feasible to support this in ol3-cesium. I'm going to investigate this.

@ahocevar Has there been any luck? Thank you.

[ahocevar]

@thinkpadder1 No sorry, didn't have time to investigate yet.

@ahocevar No problem. I made a workaround (kind of hacky). Basically, make a canvas, draw how you want your icon (I am using pure SVG, but it would be better to use a framework), then use canvas.toDataURL() to convert it to an image. You can then use this image for ol.style.Icon. Since it's an image, it looks fine in Cesium.

Maybe you can use canvas.toDataURL(), after the features are rendered with their icons, and put them in Cesium? That way you can still use ol.style.style. If I don't make any sense, I can put up a code sample?

[gberaudo]

@thinkpadder1, thank you for sharing your workaround. I will propose a redesign of the feature converter today which should allow implementing your use case. Stay tuned.