3D viewer cannot load larger detailed models

It looks the 3D viewer fails with larger models.

I have a model here with 10 detailed human cells. The model will load, and one can use the various controls, but the 3D viewer remains blank.
If I reduce the model to 8 cells, the 3D viewer loads.

So, we need to:

• optimize the geppetto model conversion to allow the 3d viewer to show larger models: come up with some ways to simplify the morphology if there are too many segments etc.
• when the model is too large and it cannot be shown in the 3d viewer, we need to inform the user and not silently fail

Data:

• Model that can be visualized: with 8 cells, no biophysics, : HL23Net_0.001.net.nml.zip
• Model that cannot be visualized: with 12 cells, no biophysics:
  HL23Net_0.001-12cells.net.nml.zip

首先将附带的 8-cell 和 12-cell 模型加载到 3D 查看器中，并在渲染结果仍为空白时跟踪模型转换路径。完成的标准是更大、更详细的模型能够成功渲染，或者当模型无法显示时，查看器能够明确告知用户，而不是静默失败。