setting startRule when using PyPRT

Mateo_Neira — Tue, 01 Aug 2023 17:15:00 GMT

I'm trying to create OBJ's using the python bindings for the procedural runtime. I have 4 shapes and I want different shapes to be generated using different rules defined in my CGA - I would normally do this by setting the startRule as an attribute of the shape.

It seems that pyprt does not support setting a StartRule file anymore? this used to be a parameter that could be set for each shape.

as an example I have:

Using the pyprt I've tried to use the shape attributes for this:

shape_attributes = [

{'shapeName': 'left_lot', 'seed': seed, "startRule": "Lots"},

{'shapeName': 'left_sidewalk', 'seed': seed, "startRule": "Sidewalks"},

{'shapeName': 'street', 'seed': seed, "startRule": "Street"},

{'shapeName': 'right_sidewalk', 'seed': seed, "startRule": "Sidewalks"},

{'shapeName': 'right_lot', 'seed': seed, "startRule": "Lots"}

]

#prt_shapes is a list containing 5 pyprt shapes

model_generator = pyprt.ModelGenerator(prt_shapes)

#my rpk with the different rules which I want to use as startRules

rpk = os.path.join(cwd, 'model.rpk')

encoder = 'com.esri.prt.codecs.OBJEncoder'

encoder_options = {

'meshGranularity': 'AS_GENERATED',

'vertexNormals': 'SET_ALL',

'baseName': "street",

'outputPath': cwd

}

generated_models = model_generator.generate_model(

shape_attributes,

rpk,

encoder,

encoder_options

)

When I run this, all models are generated using the default StartRule defined in my CGA rather than the one specified by the shape parameters.

Re: setting startRule when using PyPRT

SimonHaegler — Mon, 07 Aug 2023 08:18:41 GMT

Hi Mateo,

we removed support for explicitly setting the start rule in PyPRT 1.1 (2020), there were some problematic edge-cases (styles) and we aimed for simplicity.

How about introducing a "dispatcher" start rule which calls the desired rule based on an (enum) attribute? If you do not want to modify your existing "model" rule you could put the dispatcher into a separate rule file and use import.

Best,
Simon

Re: setting startRule when using PyPRT

Mateo_Neira — Mon, 07 Aug 2023 08:42:51 GMT

Hi Simon,

I did end up doing a similar approach to a dispatcher rule and that's all working. Thanks for the suggestion.

Best,

Mateo

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setting startRule when using PyPRT

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Re: setting startRule when using PyPRT