visualization crash

[Volker Waurich]

The visualization crashes for the following model

model visShapeSTL
  parameter String wheelShapeFile = Modelica.Utilities.Files.fullPathName("file:///wheel.stl");
  Modelica.Mechanics.MultiBody.Parts.Fixed fixed annotation(
    Placement(visible = true, transformation(origin = {-30, 0}, extent = {{-10, -10}, {10, 10}}, rotation = 0)));
  inner Modelica.Mechanics.MultiBody.World world annotation(
    Placement(visible = true, transformation(origin = {-90, 90}, extent = {{-10, -10}, {10, 10}}, rotation = 0)));
  Modelica.Mechanics.MultiBody.Visualizers.Advanced.Shape vis(
    shapeType=wheelShapeFile,
    r_shape={0,0,0},
    lengthDirection={1,0,0},
    widthDirection={0,1,0},
    length=1.0,
    width=1.0,
    height=1.0,
    color={0,128,255},
    extra=0.0,
    specularCoefficient=world.defaultSpecularCoefficient,
    r=world.frame_b.r_0,
    R=world.frame_b.R) if world.enableAnimation; annotation(
    Placement(visible = true, transformation(origin = {12, 2}, extent = {{-10, -10}, {10, 10}}, rotation = 0))); equation

annotation(
  uses(Modelica(version = "3.2.3")));
end visShapeSTL;

[Volker Waurich]

I think the file location is not given correctly. Correct me if I am wrong.
Modelica.Utilities.Files.fullPathName takes a simple file name without file://- prefix.
Besides that, OMEdit is only capable of handling constant shapeTypes. OMC will evaluate the parameter to a constant.
I would also recommend to give the CAD-file location in the shapeType using a modelica-URL modelica://packageName/cadFile.stl, as this is the common way.
Finally, OMC needs an ASCII-encoded stl. Binary formats are not supported.

[dariomangoni@…]

Replying to vwaurich:

I'm not arguing on what is the correct syntax, but on the fact that OMEdit crashes with no meaningful error.
I agree that I may have written something wrong, but it shouldn't just crash!

OMEdit crashes when parameter String wheelShapeFile = is equal to:

• Modelica.Utilities.Files.fullPathName("file:///wheel.stl")
• Modelica.Utilities.Files.fullPathName("file://wheel.stl")
• Modelica.Utilities.Files.fullPathName("wheel.stl")

The suggestion to use modelica://packageName/cadFile.stl is right, but what about scripts that are not in a package? How can I solve this?
I tried with:

• parameter String wheelShapeFile = "file:///wheel.stl";

returns Could not find the file /wheel.stl

• parameter String wheelShapeFile = "file://wheel.stl";

returns Could not find the file wheel.stl

• parameter String wheelShapeFile = "wheel.stl";

returns Unknown type wheel.stl, we make a capsule

• parameter String wheelShapeFile = "./wheel.stl";

returns Unknown type ./wheel.stl, we make a capsule.

• parameter String wheelShapeFile = "wheel.stl";

returns Unknown type /wheel.stl, we make a capsule.

BTW, with all these syntaxes, the Scripting Notification message is NOT output immediately after the simulation, but only after I go back to the model and save the script file!

[Martin Sjölund]

Running with GDB:

Warning: The binding expression Modelica.Utilities.Files.fullPathName("files:///wheel.stl") of the visualization type component wheelShapeFile  cannot be evaluated. Please specify a visualization type (CAD files are specified as modelica://packagename/filename.stl)

Running without GDB:

Limited backtrace at point of segmentation fault
/lib/x86_64-linux-gnu/libc.so.6(+0x3ef20)[0x7f194353cf20]
/usr/bin/../lib/x86_64-linux-gnu/omc/libOpenModelicaCompiler.so(omc_VisualXML_replaceVisualBinding+0x2ef)[0x7f19442b96fb]

The correct way to specify the path is parameter String wheelShapeFile = "wheel.stl"; assuming you run omc in that directory, or parameter String wheelShapeFile = "/home/marsj/tmp/wheel.stl" if you run it in OMEdit or parameter String wheelShapeFile = Modelica.Utilities.Files.loadResource("modelica://visShapeSTL/wheel.stl"); if you want it to work anywhere.

fullPathName in the ticket will not resolve any URI.

[Martin Sjölund]

It's quite important that the crash is fixed, because OMEdit should never crash...