Maxwell Render | Official public forum

Posted: **Sat Oct 31, 2015 4:55 pm**

Hi.
I use Maxwell SDK 3.2.0, Visual Studio 2013,using v120 toolset
In simple console application, i trying create simple scene with only one particle object,
try to get her points. But every time in getProxyDisplayPoints line app crash.
Code bellow

Code: Select all

#include <iostream>
#include "stdafx.h"

#include "maxwell.h"
#include "mx_defines.h"
#include "mx_extensionmanager.h"
#include "mx_geometryextension.h"
#include "mx_paramlist.h"

byte mx_error_callback(byte isError, const char *pMethod, const char *string, const void *data)
{
	if (isError)
	{
		printf( "Error in Method  = %s \n error = %s  \n value = %d\n", pMethod, string, data );
	}
	return (0);
}

int _tmain(int argc, _TCHAR* argv[])
{
	Cmaxwell previewScene(mx_error_callback);

	previewScene.setAxisConversion("YXZ");
	previewScene.setSinglePrecisionOfGeometry();

	CextensionManager::instance()->setExtensionsDirectory("E:/ext");
	CextensionManager::instance()->loadAllExtensions();
	CextensionManager::instance()->InitializeAllExtensions();	
	
	CgeometryProceduralExtension *gExtension = CextensionManager::instance()->createDefaultGeometryProceduralExtension("MaxwellParticles");
	if (gExtension != NULL)
	{
		MXparamList *pl = gExtension->getExtensionData();
		
		pl->setString("FileName", "E:/Particle_Test_01.bin");

		Cmaxwell::Cobject previewObject = previewScene.createGeometryProceduralObject("particles", pl);
		//
		gExtension->initializeForRendering(&previewScene, previewObject) << std::endl;
		//
		float *points;
		dword nPoints = 0;
		gExtension->getProxyDisplayPoints(10, 1000, nPoints, points);
		std::cout << "Num of points" << nPoints << std::endl;

	
		pl->clear();
		pl->free();
		
		delete points;
		
		gExtension->cleanup(&previewScene);
		delete gExtension;
	}

	previewScene.writeMXS("E:/test.mxs");

	previewScene.freeGeometry();
	previewScene.freeScene();
	
	return 0;
}

E:/ext is a path where maxwell extenstion located(copied from maxwell 3.2 directory)
E:/Particle_Test_01.bin is a simple particles object downloaded from http://support.nextlimit.com/display/mx ... +Particles.
mxcommon library located in same directory where placed executable file, and it loaded properly.
Other extentions types work successfull.
Application crashed in

Code: Select all

gExtension->getProxyDisplayPoints(10, 1000, nPoints, points);

line, for MaxwellVolumetric, too.

Posted: **Sun Nov 01, 2015 12:42 pm**

The initializeForRendering method is intended to be called by the engine itself just prior to rendering; in order to use the getProxyDisplay methods, you should call initializePreview and freePreview. You should not free the data returned by getProxyDisplayPoints, because it should be both allocated & freed (in initialize/freePreview) by the extension itself. So, try something more like this:

Code: Select all

static byte error_callback(byte type, const char* pMethod, const char* pError, const void*)
{
    switch (type)
    {
    case Cmaxwell::CALLBACK_WARNING:
        printf("SDK WARNING: %s @ %s", pError, pMethod);
        break;
    case Cmaxwell::CALLBACK_ERROR:
        printf("SDK ERROR: %s @ %s", pError, pMethod);
        break;
    }
    return 0;
}

static void testParticlesPreview()
{
    // Assuming extensions to be loaded already.

    Cmaxwell previewScene(error_callback);
    CgeometryProceduralExtension *gExtension = CextensionManager::instance()->createDefaultGeometryProceduralExtension("MaxwellParticles");
    if (gExtension)
    {
        MXparamList *pl = gExtension->getExtensionData();
        if (pl)
        {
            pl->setString("FileName", "Particle_Test_01.bin");
            Cmaxwell::Cobject previewObject = previewScene.createGeometryProceduralObject("particles", pl);
            if (!previewObject.isNull() && gExtension->initializePreview(&previewScene, previewObject))
            {
                float* points = 0;
                dword nPoints = 0;
                if (gExtension->getProxyDisplayPoints(10, 1000, nPoints, points))
                {
                    for (dword i = 0; i < nPoints; ++i)
                        printf("pt: %f,%f,%f\n", points[i*3+0], points[i*3+1], points[i*3+2]);
                }
                gExtension->freePreview();
            }
        }
        delete gExtension;
    }
}

Posted: **Sun Nov 01, 2015 3:37 pm**

OK. thanks.
What about deleting MxparamList returned
by getExtensionDate().
It would deleting when I call extension cleanUp? Or must delete it manually.
Thanks again.

Posted: **Sun Nov 01, 2015 4:00 pm**

Don't delete that, the extension owns it. Don't call cleanup either; that is intended to be called by the render engine (like initializeForRendering). Generally, the only methods you will need to call on an extension are getExtensionData, initializePreview, freePreview, and the getProxyDisplay methods.

Posted: **Sun Nov 01, 2015 4:15 pm**

OK.
One question about geomertyprocedurals.
How I must get Bounding Box of all object.
When I call getBoundingBox it always get zero. points

Posted: **Sun Nov 01, 2015 4:39 pm**

I do not think there is any guarantee that you will get a valid bounding box by calling that. It would ultimately depend on the extension in question, and whether it calculates & caches its bounding box when initializePreview is called, or only when initializeForRendering is called. If it returns a zero-size box after calling initializePreview, either the box is of zero size, or you will need to calculate it yourself by iterating the lines, points, or faces, from one of the getProxyDisplay methods (which are all optional for the extension).

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Maxwell Particles getProxyDisplayPoints get crashed

Maxwell Particles getProxyDisplayPoints get crashed

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Re: Maxwell Particles getProxyDisplayPoints get crashed

Re: Maxwell Particles getProxyDisplayPoints get crashed