samples: add 3 more soft-body tests

src/test/java/testjoltjni/app/samples/SmokeTestAll.java

@@ -314,6 +314,9 @@ private static void smokeTestSoftBody() {
         smokeTest(new SoftBodyContactListenerTest());
         smokeTest(new SoftBodyCustomUpdateTest());
         smokeTest(new SoftBodyForceTest());
+        smokeTest(new SoftBodyFrictionTest());
+        smokeTest(new SoftBodyGravityFactorTest());
+        smokeTest(new SoftBodyLRAConstraintTest());
         smokeTest(new SoftBodyPressureTest());
         smokeTest(new SoftBodyUpdatePositionTest());
     }

src/test/java/testjoltjni/app/samples/softbody/SoftBodyFrictionTest.java

@@ -0,0 +1,66 @@
+/*
+Copyright (c) 2025 Stephen Gold
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+ */
+package testjoltjni.app.samples.softbody;
+import com.github.stephengold.joltjni.*;
+import com.github.stephengold.joltjni.enumerate.*;
+import testjoltjni.app.samples.*;
+/**
+ * A line-for-line Java translation of the Jolt Physics soft-body friction test.
+ * <p>
+ * Compare with the original by Jorrit Rouwe at
+ * https://github.com/jrouwe/JoltPhysics/blob/master/Samples/Tests/SoftBody/SoftBodyFrictionTest.cpp
+ */
+public class SoftBodyFrictionTest extends Test{
+
+public void Initialize()
+{
+	// Floor
+	Body floor = CreateFloor();
+	floor.setFriction(1.0f);
+
+	// Bodies with increasing friction
+	SoftBodySharedSettingsRef sphere_settings = SoftBodyCreator.CreateSphere();
+	for (Vertex v : sphere_settings.getPtr().getVertices())
+		v.setVelocity (new Float3(0, 0, 10));
+	SoftBodyCreationSettings sphere=new SoftBodyCreationSettings(sphere_settings, RVec3.sZero(), Quat.sIdentity(), Layers.MOVING);
+	sphere.setPressure ( 2000.0f);
+
+	for (int i = 0; i <= 10; ++i)
+	{
+		sphere.setPosition (new RVec3(-50.0f + i * 10.0f, 1.0f, 0));
+		sphere.setFriction ( 0.1f * i);
+		mBodyInterface.createAndAddSoftBody(sphere, EActivation.Activate);
+	}
+
+	SoftBodySharedSettingsRef cube_settings = SoftBodySharedSettings.sCreateCube(5, 0.5f);
+	for (Vertex v : cube_settings.getPtr().getVertices())
+		v.setVelocity (new Float3(0, 0, 10));
+	SoftBodyCreationSettings cube=new SoftBodyCreationSettings(cube_settings, RVec3.sZero(), Quat.sIdentity(), Layers.MOVING);
+
+	for (int i = 0; i <= 10; ++i)
+	{
+		cube.setPosition (new RVec3(-50.0f + i * 10.0f, 1.0f, -5.0f));
+		cube.setFriction ( 0.1f * i);
+		mBodyInterface.createAndAddSoftBody(cube, EActivation.Activate);
+	}
+}
+}

src/test/java/testjoltjni/app/samples/softbody/SoftBodyGravityFactorTest.java

@@ -0,0 +1,59 @@
+/*
+Copyright (c) 2025 Stephen Gold
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+ */
+package testjoltjni.app.samples.softbody;
+import com.github.stephengold.joltjni.*;
+import com.github.stephengold.joltjni.enumerate.*;
+import testjoltjni.app.samples.*;
+/**
+ * A line-for-line Java translation of the Jolt Physics soft-body gravity-factor test.
+ * <p>
+ * Compare with the original by Jorrit Rouwe at
+ * https://github.com/jrouwe/JoltPhysics/blob/master/Samples/Tests/SoftBody/SoftBodyGravityFactorTest.cpp
+ */
+public class SoftBodyGravityFactorTest extends Test{
+
+public void Initialize()
+{
+	// Floor
+	CreateFloor();
+
+	// Bodies with increasing gravity factor
+	SoftBodyCreationSettings sphere=new SoftBodyCreationSettings(SoftBodyCreator.CreateSphere(), RVec3.sZero(), Quat.sIdentity(), Layers.MOVING);
+	sphere.setPressure ( 2000.0f);
+
+	for (int i = 0; i <= 10; ++i)
+	{
+		sphere.setPosition (new RVec3(-50.0f + i * 10.0f, 10.0f, 0));
+		sphere.setGravityFactor ( 0.1f * i);
+		mBodyInterface.createAndAddSoftBody(sphere, EActivation.Activate);
+	}
+
+	SoftBodyCreationSettings cube=new SoftBodyCreationSettings(SoftBodySharedSettings.sCreateCube(5, 0.5f), RVec3.sZero(), Quat.sIdentity(), Layers.MOVING);
+
+	for (int i = 0; i <= 10; ++i)
+	{
+		cube.setPosition (new RVec3(-50.0f + i * 10.0f, 10.0f, -5.0f));
+		cube.setGravityFactor ( 0.1f * i);
+		mBodyInterface.createAndAddSoftBody(cube, EActivation.Activate);
+	}
+}
+}

src/test/java/testjoltjni/app/samples/softbody/SoftBodyLRAConstraintTest.java

@@ -0,0 +1,62 @@
+/*
+Copyright (c) 2025 Stephen Gold
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+ */
+package testjoltjni.app.samples.softbody;
+import com.github.stephengold.joltjni.*;
+import com.github.stephengold.joltjni.enumerate.*;
+import java.util.function.BiFunction;
+import testjoltjni.app.samples.*;
+/**
+ * A line-for-line Java translation of the Jolt Physics soft-body LRA-constraint test.
+ * <p>
+ * Compare with the original by Jorrit Rouwe at
+ * https://github.com/jrouwe/JoltPhysics/blob/master/Samples/Tests/SoftBody/SoftBodyLRAConstraintTest.cpp
+ */
+public class SoftBodyLRAConstraintTest extends Test{
+float cVertexSpacing=.5f;
+int cNumVerticesX=10,cNumVerticesZ = 50;
+
+public void Initialize()
+{
+	CreateFloor();
+
+	for (int i = 0; i < 2; ++i)
+	{
+ 		BiFunction<Integer,Integer,Float> inv_mass = (Integer inX, Integer inZ)-> { return inZ < 2? 0.0f : 1.0f; };
+		BiFunction<Integer,Integer,Vec3> perturbation = (Integer inX, Integer inZ)-> { return Vec3.sZero(); };
+
+		VertexAttributes va=new VertexAttributes();
+		va.setShearCompliance ( va.setCompliance ( 1.0e-3f)); // Soften the edges a bit so that the effect of the LRA constraints is more visible
+		va.setLraType ( i == 0? ELraType.None : ELraType.EuclideanDistance);
+
+		SoftBodySharedSettingsRef cloth_settings = SoftBodyCreator.CreateCloth(cNumVerticesX, cNumVerticesZ, cVertexSpacing, inv_mass, perturbation, EBendType.None, va);
+
+		SoftBodyCreationSettings cloth=new SoftBodyCreationSettings(cloth_settings,new RVec3(-10.0f + i * 20.0f, 25.0f, 0), Quat.sIdentity(), Layers.MOVING);
+		mBodyInterface.createAndAddSoftBody(cloth, EActivation.Activate);
+	}
+}
+
+public void PrePhysicsUpdate(PreUpdateParams inParams)
+{
+	mDebugRenderer.drawText3D(new RVec3(-10, 26, -0.5f * cNumVerticesZ * cVertexSpacing), "Without LRA constraints", Color.sWhite);
+	mDebugRenderer.drawText3D(new RVec3(10, 26, -0.5f * cNumVerticesZ * cVertexSpacing), "With LRA constraints", Color.sWhite);
+}
+}