Points on Surface C#

Hi All,

I am trying to get points on surface by asking the user to input a surface, U and V values in a C# component. I think I am close but I am getting this error saying cast:int 32. If anyone has any clue why I am getting this one I would appreciate the most to share it with me. Thanks!

Here is my code:

protected override void SolveInstance(IGH_DataAccess DA)

{

/// 1 - Define local variables to catch the incoming data from Grasshopper

int myUvalue = 0;

int myVvalue = 0;

Point3d myOutPt = new Point3d();

Vector3d[] myOutVects = new Vector3d[0];

/// Populate local variables (and defense)

Rhino.Geometry.

Surface myIntSrf = null;

if (!DA.GetData<Rhino.Geometry.Surface>(0, ref myIntSrf) || !myIntSrf.IsValid) { return; }

if (!DA.GetData(1, ref myUvalue)) { return; }

if (!DA.GetData(2, ref myVvalue)) { return; }

/// Reparameterize Surface

Interval Uinterval = new Interval();

Interval Vinterval = new Interval();

Uinterval = myIntSrf.Domain(0);

Vinterval = myIntSrf.Domain(1);

double param0 = 0.0;

double param1 = 0.0;

for (int i = 0; i < myUvalue; i++)

{

param0 = Uinterval[0] + (((Uinterval[1] - Uinterval[0]) / (myUvalue - 1)) * i);

for (int j = 0; j < myVvalue; j++)

{

param1 = Vinterval[0] + (((Vinterval[1] - Vinterval[0]) / (myVvalue - 1)) * j);

myIntSrf.Evaluate(param0, param1, myUvalue, out myOutPt,out myOutVects);

}

/// Populate outputs

///DA.SetData(0, myIntSrf);

DA.SetData(0, myOutPt);

}

Replies to This Discussion

Permalink Reply by David Rutten on November 29, 2012 at 5:51am

Can you post the entire component source so I can compile it here the same way?

Alternatively, what does the error look like? If you put a breakpoint in your SolveInstance method, at what line does the exception occur?

David Rutten

david@mcneel.com

Poprad, Slovakia

Permalink Reply by Georios on November 29, 2012 at 6:55pm

Sorry for the really late response I was away from my files for the whole day. David here is the whole component source. Thank you!

using

System;

using

System.Collections.Generic;

using

Grasshopper.Kernel;

using

Rhino;

using

Rhino.Commands;

using

Grasshopper.Getters;

using

Rhino.Geometry;

using

Grasshopper.Plugin;

using

Grasshopper.Kernel.Types;

using

Grasshopper.Kernel.Data;

namespace

Louver

{

public class Louver : GH_Component

{

/// <summary>

/// Each implementation of GH_Component must provide a public

/// constructor without any arguments.

/// Category represents the Tab in which the component will appear,

/// Subcategory the panel. If you use non-existing tab or panel names,

/// new tabs/panels will automatically be created.

/// </summary>

public Louver()

base("LouverGeometry", "LG",

"Creates Louvers from imported surface",

"LOUVERS", "Subcategory")

{

}

/// <summary>

/// Registers all the input parameters for this component.

/// </summary>

protected override void RegisterInputParams(GH_Component.GH_InputParamManager pManager)

{

pManager.AddSurfaceParameter(

"Glazing Surface", "GS", "The surface to create Louvers on", GH_ParamAccess.item);

pManager.AddNumberParameter(

"U value", "U", "U number of panels", GH_ParamAccess.item);

pManager.AddNumberParameter(

"V value", "V", "V number of panels", GH_ParamAccess.item);

/// pManager.AddNumberParameter("Rotation of Louvers", "RL", "The desired rotation of the Louvers", GH_ParamAccess.item);

}

/// <summary>

/// Registers all the output parameters for this component.

/// </summary>

protected override void RegisterOutputParams(GH_Component.GH_OutputParamManager pManager)

{

///pManager.Register_SurfaceParam("Louvers", "LG", "Louver Geometry", 0);

pManager.Register_PointParam(

"Pt", "Points", "Eval Pts", GH_ParamAccess.list);

}

/// <summary>

/// This is the method that actually does the work.

/// </summary>

/// <param name="DA">The DA object can be used to retrieve data from input parameters and

/// to store data in output parameters.</param>

protected override void SolveInstance(IGH_DataAccess DA)

{

/// 1 - Define local variables to catch the incoming data from Grasshopper

int myUvalue = 0;

int myVvalue = 0;

Point3d myOutPt = new Point3d();

Vector3d[] myOutVects = new Vector3d[0];

/// Populate local variables (and defense)

Rhino.Geometry.

Surface myIntSrf = null;

if (!DA.GetData<Rhino.Geometry.Surface>(0, ref myIntSrf) || !myIntSrf.IsValid) { return; }

if (!DA.GetData(1, ref myUvalue)) { return; }

if (!DA.GetData(2, ref myVvalue)) { return; }

/// Reparameterize Surface

Interval Uinterval = new Interval();

Interval Vinterval = new Interval();

Uinterval = myIntSrf.Domain(0);

Vinterval = myIntSrf.Domain(1);

double param0 = 0.0;

double param1 = 0.0;

for (int i = 0; i < myUvalue; i++)

{

param0 = Uinterval[0] + (((Uinterval[1] - Uinterval[0]) / (myUvalue - 1)) * i);

for (int j = 0; j < myVvalue; j++)

{

param1 = Vinterval[0] + (((Vinterval[1] - Vinterval[0]) / (myVvalue - 1)) * j);

myIntSrf.Evaluate(param0, param1, myUvalue,

out myOutPt,out myOutVects);

}

/// Populate outputs

///DA.SetData(0, myIntSrf);

DA.SetData(0, myOutPt);

}

/// <summary>

/// Provides an Icon for every component that will be visible in the User Interface.

/// Icons need to be 24x24 pixels.

/// </summary>

protected override System.Drawing.Bitmap Icon

{

get

{

Permalink Reply by Georios on November 29, 2012 at 7:03pm

I fixed the cast: int error message by changing the pManager.AddNumberParameter to pManager.AddIntegerParameter. But I still need to fine tune it as I am not getting the evaluation points out.

Permalink Reply by David Rutten on November 30, 2012 at 3:43am

There were several weird things in that file. I attached a cs file that seems to do what you're after.

David Rutten

david@mcneel.com

Poprad, Slovakia

Attachments: