Building SoftBody-Bullet on Win10

shamanDevel · April 4, 2018, 8:20am

Hello,

last week I tried to use the Soft Body Physics library that @Dokthar designed ([devlog] Bullet SoftBody in JME3.1 - #63 by shamanDevel). I ran into several issues and after some PM, Dokthar advised me that I should open a new thread here, so that others with the same errors might profit from the results.

My operating system: Windows 10 64bit, Visual Studio Enterprise 2017 Version 15.5.

The issue: The repository GitHub - dokthar/jmonkeyengine at bullet_SoftBody-v3.2.1 contains old, outdated prebuild binaries. For the newest version, you have to build them on your own.
Based on the documentation (https://jmonkeyengine.github.io/wiki/jme3/advanced/softbody.html) I followed those steps:

Clone the repository
Set buildNativeProjects=true in gradle.properties
Run ./gradlew build
Link against jme3-bullet.jar (with natives), instead of jme-jbullet.jar

While this works on Linux, it doesn’t on Windows. The build runs without any information or warning that c++ files are compiled or not. When I run the test file, see at the bottom, I get java.lang.UnsatisfiedLinkErrors that some functions are not found.

What I tried:

A dumpbin of the bulletjme.dll shows that indeed many functions related to soft body physics are missing. Further, this file is identical to the prebuild binary from the repository → the old version is used, no rebuild happens
Then I deleted the prebuild binaries from the repository, maybe this triggers a recompilation. No, the jar with the native libraries is empty
Dokthar then pointed me to the target ./gradlew.bat BulletjmeWindows64SharedLibrary that is actually responsible for the compilation. I executed it and ran into the error that no toolkit was found
Based on 4.3.1: No tool chain is available to build for platform 'windows_x86': · Issue #285 · gradle/gradle-native · GitHub I added the link to the Visual Studio in build.graddle. Build failed with the error that this folder does not point to a supported Visual Studio installation
According to Support for MSVC 17 (Visual Studio "15") - Feature request? · Issue #873 · gradle/gradle · GitHub, VS2017 wasn’t supported in version 4.3. jme3 uses version 4.1. So I updated the gradle version to the latest version 4.6 in gradle/wrapper/gradle-wrapper.properties. Now I get a StackOverflowException, the log shows
Cannot locate header file for '#include INVDYN_INCLUDE_HELPER(BT_CUSTOM_INVERSE_DYNAMICS_CONFIG_H)' in source file 'IDConfig.hpp'. Assuming changed. (File bullet3-2…86.1/src/BulletInverseDynamics/IDConfig.hpp, line 50)
Any ideas?
I couldn’t find any solution to that within Gradle, so I imported all c++ source files into Visual Studio and used their build system to manually compile the native .dll. The compilation succeeded.

The test file below now runs without any UnsatisfiedLinkError, but I still don’t get the expected result. Either the ball disappears immediately (after the first frame, location always stays at 0,0,0); or the simulation blocks forever in PhysicsSpace.stepSimulation. Since I don’t know if this is related to the build of the native library or if the Java code is faulty, @Dokthar, can you test it?

Any help is appreciated.

Appendix, the test code:

import com.jme3.app.SimpleApplication;
import com.jme3.bullet.BulletSoftBodyAppState;
import com.jme3.bullet.control.RigidBodyControl;
import com.jme3.bullet.control.SoftBodyControl;
import com.jme3.bullet.objects.PhysicsSoftBody;
import com.jme3.bullet.objects.infos.SoftBodyWorldInfo;
import com.jme3.material.Material;
import com.jme3.math.Vector3f;
import com.jme3.scene.Geometry;
import com.jme3.scene.shape.Box;
import com.jme3.scene.shape.Sphere;

public class SoftBodyTest extends SimpleApplication {

    private BulletSoftBodyAppState softBodyAppState;
    private Geometry sphere;

    public static void main(String[] args) {
        SoftBodyTest app = new SoftBodyTest();
        app.start();
    }

    @Override
    public void simpleInitApp() {
        softBodyAppState = new BulletSoftBodyAppState();
        getStateManager().attach(softBodyAppState);

        SoftBodyWorldInfo sbwi = softBodyAppState.getPhysicsSoftSpace().getWorldInfo();
        sbwi.setGravity(Vector3f.UNIT_Y.mult(-0.981f));

        sphere = new Geometry("sphere", new Sphere(16, 16, 1));
        Material matN = new Material(assetManager, "Common/MatDefs/Misc/ShowNormals.j3md");
        sphere.setMaterial(matN);
        rootNode.attachChild(sphere);
        sphere.addControl(new SoftBodyControl(false));

        PhysicsSoftBody soft = sphere.getControl(SoftBodyControl.class);
        soft.generateClusters(8);
        soft.config().setDynamicFrictionCoef(0.8f);
        soft.config().setPoseMatchingCoef(0.2f);
        soft.config().setCollisionsFlags(PhysicsSoftBody.Config.CL_SS + PhysicsSoftBody.Config.CL_RS);
        soft.setPose(false, true);
        soft.setTotalMass(100, true);
        soft.randomizeConstraints();
        softBodyAppState.getPhysicsSoftSpace().add(soft);

        Box floorMesh = new Box(100f, 0.5f, 100f);
        Geometry floor = new Geometry("floor", floorMesh);
        floor.move(0, -5f, 0);
        floor.addControl(new RigidBodyControl(0));
        softBodyAppState.getPhysicsSpace().add(floor);
    }

    @Override
    public void simpleUpdate(float tpf) {
        System.out.println(sphere.getLocalTranslation());
    }
}

Dokthar · April 4, 2018, 12:09pm

Run ./gradlew buildand ./gradlew build

~~./gadlew build and ./gradlew dist~~

Edit:
The dist task only copy the jar needed for the examples (and jbullet is used by default).

shamanDevel · April 6, 2018, 7:08am

Ah, yes, small typo. I corrected the post.
But I still haven’t made any progress.

shamanDevel · April 7, 2018, 8:39am

For testing purposes, I tried to compile it with Ubuntu and there the compilation works.

But now I ran into another issue: the sphere grows into infinity.
Here is the log of the transformation of the sphere and the contents of the vertex position buffer:

Transform[ 0.0, 1.0, 0.0]
[ -0.0, -0.0, -0.0, 1.0]
[ 1.0 , 1.0, 1.0]
Vertices: 
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Transform[ 0.0, 0.0, 0.0]
[ -0.0, -0.0, -0.0, 1.0]
[ 1.0 , 1.0, 1.0]
Vertices: 
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Transform[ 0.0, 0.0, 0.0]
[ -0.0, -0.0, -0.0, 1.0]
[ 1.0 , 1.0, 1.0]
Vertices: 
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@Dokthar Do you have an idea what might cause this behavior?