(June 2022) Monthly WIP Screenshot Thread

sgold · June 5, 2022, 11:34pm

Pachinko, anyone?

stephengold/Minie/blob/b0a61bab6e91e99d398173f9e567c825b9b88161/MinieExamples/src/main/java/jme3utilities/minie/test/Pachinko.java

/*
 Copyright (c) 2022, Stephen Gold
 All rights reserved.

 Redistribution and use in source and binary forms, with or without
 modification, are permitted provided that the following conditions are met:
 * Redistributions of source code must retain the above copyright
 notice, this list of conditions and the following disclaimer.
 * Redistributions in binary form must reproduce the above copyright
 notice, this list of conditions and the following disclaimer in the
 documentation and/or other materials provided with the distribution.
 * Neither the name of the copyright holder nor the names of its contributors
 may be used to endorse or promote products derived from this software without
 specific prior written permission.

 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
 FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL

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Pavl_G · June 6, 2022, 1:30am

Nice, i prefer pinball , it will be great to run using physics, oh an application for the new minie gears too

sailsman63 · June 6, 2022, 12:14pm

Ooh… Maybe tie into a smartphone/tablet’s accelerometer set, so the player can cheat/tap, but watch out for actually tilting…

Pavl_G · June 6, 2022, 12:34pm

Yeah nice idea, i did something similar to this before using a combination Geomagnetic and Accelerometer sensors (also known as orientation software sensor) to get the device orientation matrix on a jme vehicle was working fine, i will be getting this code ready for the public use soon .

pspeed · June 11, 2022, 6:39pm

In a way small news since implementing again the thing you’ve already implemented before isn’t that big of a deal… but progress is progress.

The new Mythruna engine now has a built-in blueprint editor again.

This was one of the defining features of Mythruna so it’s nice to have it back again. And it’s nice to know that it will definitely be in the 10 year anniversary release (since the last public release) at the end of June.

sgold · June 15, 2022, 7:33pm

A new physics demo, simulating a cable coiled around a winch:

github.com

stephengold/Minie/blob/master/MinieExamples/src/main/java/jme3utilities/minie/test/Windlass.java

/*
 Copyright (c) 2022, Stephen Gold
 All rights reserved.

 Redistribution and use in source and binary forms, with or without
 modification, are permitted provided that the following conditions are met:
 * Redistributions of source code must retain the above copyright
 notice, this list of conditions and the following disclaimer.
 * Redistributions in binary form must reproduce the above copyright
 notice, this list of conditions and the following disclaimer in the
 documentation and/or other materials provided with the distribution.
 * Neither the name of the copyright holder nor the names of its contributors
 may be used to endorse or promote products derived from this software without
 specific prior written permission.

 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
 FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL

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capdevon · June 21, 2022, 8:58am

Hello everyone,
after days of study, research and a lot of effort, here is a prototype of a flame thrower.

In the video you can see the following features:

Enemies are constantly regenerating over time.
They have a numerical health indicator on their heads and change color to red to view the damage caused by the flames.
The flames go out after a certain period of time by changing the color of the enemies to gray.
The flamethrower is discharged using it, see the ammo info at the top left of the game screen.
The rotating red boxes represent ammo that can be collected by walking over them.

Let me know what you like and what you would do differently.
I used the particle system already integrated with the engine. Let me know if you have ever used other libraries for particle effects.

I hope to see your works soon. Keep the flame of your creativity burning

Pavl_G · June 21, 2022, 11:49am

Great job , i was planning to use toneg0d emitters for similar artistic work (a car nitro) but didn’t find the opportunity, but i still think its still better to defer the time and the work to the stock emitter.

sgold · June 21, 2022, 4:16pm

Which aspects required the most effort?

kevinba99 · June 22, 2022, 4:44am

You asked for nit picks. Here is my (TWO CENTS)

When someone is standing right behind the person in front. the flame only hurts the person in front but the particles (APPEAR) to be going through the person in the back. So I would either stop the particles if it hits something or hurt the person behind.

It appears it should be getting the person because their are standing in the flames and the flames around around them but they are not hurt until (HP) hits 0 on the person in front.

At the start of the sequence, the person catches on fire before the particles (APPEAR) to hit the person. The detection seems to be on the first particle but (VISUALLY) it is a bit soon.

Ali_RS · June 22, 2022, 5:55am

@capdevon, It looks cool

Is this using soft particles?

oxplay2 · June 22, 2022, 8:04am

looks great, i would just generally:

make that 2 characters at once can be burning(in line, because i see it burn only first one).
Add smoke from certain areas like (like burning/burned person and flame itself, also a weapon ending)
make characters more-slowly gain color/burn

and thats all

yaRnMcDonuts · June 22, 2022, 8:46am

I’ve recently been using the ParticleMonkey library and am liking it better than the engine’s stock emitter. The stock particle emitter works well for certain types of things but overall isn’t as versatile or good looking as Particle Monkey I’d say.

With particle monkey I think you could make the particle emitter have physics, and then if the character also has a physics body, then the particles would naturally bounce off of the character and would prevent the particles from going through them.

Ali_RS · June 22, 2022, 9:22am

@yaRnMcDonuts, by the way, do you know if ParticleMonkey supports soft particles?

yaRnMcDonuts · June 22, 2022, 9:30am

I’m not sure, maybe @glh3586 could answer though since he made the Particle Monkey library.

capdevon · June 22, 2022, 12:40pm

Thanks everyone for the feedback, I really appreciate your sincerity and your ideas. I will need some time to answer everyone, there are a lot of technical details that I would like to discuss with you. I will create a dedicated thread for this topic.

kevinba99 · June 22, 2022, 3:56pm

Would be go for somethings, but fire bouncing off an object, doesnt’ work. now if you could not make it bounce and just turn like fire would do. that would work.

capdevon · June 22, 2022, 4:17pm

I tried the library ParticleMonkey. I appreciate the contribution of the author. Many things can be learned from his design, such as physical particles and much more. However I don’t know if it is still maintained. The latest release is from 2020. The wiki is present, but the author has deleted the examples, which makes it difficult to understand how to use it. Do you know where I can find examples? It does not have a graphic editor. This is a big deal. Do you know if there are any?

grizeldi · June 22, 2022, 5:49pm

This might be a bit of a tangent, but you might find it useful.

A little while ago when I started working as a junior VFX artist, I did a comprehensive check of various particle systems in jme, so I could do some experiments in my free time. And the results were… not great. Sadly there were problems with most of them.

Stock system: well integrated into SDK, but SDK is a couple versions of JME behind and buggy. I had problems with glow on materials. It might be solvable by using a custom shader, but I didn’t get that deep into it at the time.
ParticleMonkey: couldn’t find documentation on it, nor a graphical editor. The promised features sound amazing, but I couldn’t set it up
GitHub - destroflyer/jme3-effekseer: Library to load Effekseer particle effects in jMonkeyEngine 3. Uses an external editor (Effekseer) which takes time getting used to, but is the best graphical particle editor available for JME in my opinion. Sadly the linked library only supports files from an older version of Effekseer, as they changed the save format recently, so I couldn’t use it.
GitHub - riccardobl/jme-effekseerNative: This is a library that uses EffekseerForMultiLanguages to load and render effects made with Effekseer in jme. The same as above, but uses native Effekseer runtime to render the effects and thus supports the latest save file version. The way it gets the image data into jme feels a bit hacky and may cause problems in bigger projects, but in my short testing it seemed fine.

Overall, to a VFX artist used to Unity on Unreal editors for particles, I’d say the last option is the only one that is at least semi decent.

capdevon · June 22, 2022, 6:07pm

In general it was all complicated. It was difficult to design a test case. I searched for reference material for flamethrowers, but found no interesting examples, not even in Unity. Particle effects are probably a weak point of the engine. There is still an open bug that I reported some time ago.

github.com/jMonkeyEngine/jmonkeyengine

Bug: Wrong particle position when using 'EmitterMeshVertexShape' or 'EmitterMeshFaceShape' and worldSpace flag equal to true.

opened 04:32PM - 18 Feb 22 UTC

closed 05:55PM - 10 Jan 23 UTC

capdevon

bug

Using the shape emitters (`EmitterMeshVertexShape` or `EmitterMeshFaceShape` wit…h `worldSpace` = true), the particles are generated neither from the vertices nor from the faces of the 3d model, but in a position that seems to correspond to the position of the `ParticleEmitter`. The bug could have been introduced with the following [commit 6075e463](https://github.com/jMonkeyEngine/jmonkeyengine/commit/6075e4639d3c15f7ed497db13c5a60aeeb282b82). ![bug](https://user-images.githubusercontent.com/32201701/154723388-9971ae1c-c5c1-468a-836b-18d52dbaabe7.jpg) Here is the test case: ```java package mygame; import java.util.Arrays; import com.jme3.animation.LoopMode; import com.jme3.app.SimpleApplication; import com.jme3.cinematic.MotionPath; import com.jme3.cinematic.events.MotionEvent; import com.jme3.effect.ParticleEmitter; import com.jme3.effect.ParticleMesh.Type; import com.jme3.effect.shapes.EmitterMeshFaceShape; import com.jme3.effect.shapes.EmitterMeshVertexShape; import com.jme3.font.BitmapFont; import com.jme3.font.BitmapText; import com.jme3.input.KeyInput; import com.jme3.input.controls.ActionListener; import com.jme3.input.controls.KeyTrigger; import com.jme3.input.controls.Trigger; import com.jme3.light.AmbientLight; import com.jme3.light.DirectionalLight; import com.jme3.material.Material; import com.jme3.material.Materials; import com.jme3.math.ColorRGBA; import com.jme3.math.FastMath; import com.jme3.math.Vector2f; import com.jme3.math.Vector3f; import com.jme3.post.FilterPostProcessor; import com.jme3.post.filters.BloomFilter; import com.jme3.post.filters.FXAAFilter; import com.jme3.renderer.queue.RenderQueue; import com.jme3.scene.Geometry; import com.jme3.scene.Mesh; import com.jme3.scene.Node; import com.jme3.scene.shape.CenterQuad; import com.jme3.scene.shape.Torus; import com.jme3.shadow.DirectionalLightShadowFilter; import com.jme3.system.AppSettings; import com.jme3.texture.Texture; /** * * @author capdevon */ public class Test_ParticleIssue extends SimpleApplication implements ActionListener { /** * * @param args */ public static void main(String[] args) { Test_ParticleIssue app = new Test_ParticleIssue(); AppSettings settings = new AppSettings(true); settings.setResolution(1280, 720); settings.setRenderer(AppSettings.LWJGL_OPENGL32); app.setSettings(settings); app.setPauseOnLostFocus(false); app.setShowSettings(false); app.start(); } private ParticleEmitter emit; private Node myModel; private BitmapText emitUI; private MotionEvent motionControl; private boolean playing; @Override public void simpleInitApp() { BitmapText hud = createTextUI(ColorRGBA.White, 20, 15); hud.setText("Play/Pause Motion: KEY_SPACE, InWorldSpace: KEY_I"); emitUI = createTextUI(ColorRGBA.Blue, 20, 15 * 2); configCamera(); setupLights(); setupScene(); setupCircle(); createMotionControl(); setupKeys(); } private void setupCircle() { myModel = new Node("FieryCircle"); Geometry torus = createTorus(1f); myModel.attachChild(torus); emit = createParticleEmitter(torus, true); myModel.attachChild(emit); rootNode.attachChild(myModel); } private Geometry createTorus(float radius) { float s = radius / 8f; Geometry geo = new Geometry("CircleXZ", new Torus(64, 4, s, radius)); Material mat = new Material(assetManager, "Common/MatDefs/Misc/Unshaded.j3md"); mat.setColor("Color", ColorRGBA.Blue); mat.getAdditionalRenderState().setWireframe(true); geo.setMaterial(mat); return geo; } /** * emits the particles from the given shape's vertices. It doesn't work. */ private ParticleEmitter createParticleEmitter(Geometry geo, boolean pointSprite) { Type type = pointSprite ? Type.Point : Type.Triangle; ParticleEmitter emitter = new ParticleEmitter("Emitter", type, 1000); Material mat = new Material(assetManager, "Common/MatDefs/Misc/Particle.j3md"); mat.setTexture("Texture", assetManager.loadTexture("Effects/Smoke/Smoke.png")); mat.setBoolean("PointSprite", pointSprite); emitter.setMaterial(mat); emitter.setLowLife(1); emitter.setHighLife(1); emitter.setImagesX(15); emitter.setStartSize(0.04f); emitter.setEndSize(0.02f); emitter.setStartColor(ColorRGBA.Orange); emitter.setEndColor(ColorRGBA.Red); emitter.setParticlesPerSec(900); emitter.setGravity(0, 0f, 0); //emitter.getParticleInfluencer().setVelocityVariation(1); //emitter.getParticleInfluencer().setInitialVelocity(new Vector3f(0, .5f, 0)); emitter.setShape(new EmitterMeshVertexShape(Arrays.asList(geo.getMesh()))); //emitter.setShape(new EmitterMeshFaceShape(Arrays.asList(geo.getMesh()))); return emitter; } private void createMotionControl() { float radius = 5f; float height = 1.10f; MotionPath path = new MotionPath(); path.setCycle(true); for (int i = 0; i < 8; i++) { float x = FastMath.sin(FastMath.QUARTER_PI * i) * radius; float z = FastMath.cos(FastMath.QUARTER_PI * i) * radius; path.addWayPoint(new Vector3f(x, height, z)); } //path.enableDebugShape(assetManager, rootNode); motionControl = new MotionEvent(myModel, path); motionControl.setLoopMode(LoopMode.Loop); //motionControl.setInitialDuration(15f); //motionControl.setSpeed(2f); motionControl.setDirectionType(MotionEvent.Direction.Path); } private void setupKeys() { addMapping("ToggleMotionEvent", new KeyTrigger(KeyInput.KEY_SPACE)); addMapping("InWorldSpace", new KeyTrigger(KeyInput.KEY_I)); } private void addMapping(String mappingName, Trigger... triggers) { inputManager.addMapping(mappingName, triggers); inputManager.addListener(this, mappingName); } @Override public void onAction(String name, boolean isPressed, float tpf) { if (name.equals("InWorldSpace") && isPressed) { boolean worldSpace = emit.isInWorldSpace(); emit.setInWorldSpace(!worldSpace); } else if (name.equals("ToggleMotionEvent") && isPressed) { if (playing) { playing = false; motionControl.pause(); } else { playing = true; motionControl.play(); } } } @Override public void simpleUpdate(float tpf) { emitUI.setText("InWorldSpace: " + emit.isInWorldSpace()); } private void configCamera() { flyCam.setDragToRotate(true); flyCam.setMoveSpeed(10); cam.setLocation(new Vector3f(0, 6f, 9.2f)); cam.lookAt(Vector3f.UNIT_Y, Vector3f.UNIT_Y); float aspect = (float) cam.getWidth() / cam.getHeight(); cam.setFrustumPerspective(45, aspect, 0.1f, 1000f); } private void setupScene() { CenterQuad quad = new CenterQuad(12, 12); quad.scaleTextureCoordinates(new Vector2f(2, 2)); Geometry floor = createMesh("Floor", quad); floor.rotate(-FastMath.HALF_PI, 0, 0); rootNode.attachChild(floor); } private Geometry createMesh(String name, Mesh mesh) { Geometry geo = new Geometry(name, mesh); Material mat = new Material(assetManager, Materials.LIGHTING); Texture tex = assetManager.loadTexture("Interface/Logo/Monkey.jpg"); tex.setWrap(Texture.WrapMode.Repeat); mat.setTexture("DiffuseMap", tex); geo.setMaterial(mat); return geo; } private void setupLights() { viewPort.setBackgroundColor(ColorRGBA.DarkGray); rootNode.setShadowMode(RenderQueue.ShadowMode.CastAndReceive); AmbientLight ambient = new AmbientLight(); ambient.setColor(ColorRGBA.White); //rootNode.addLight(ambient); DirectionalLight sun = new DirectionalLight(); sun.setDirection((new Vector3f(-0.5f, -0.5f, -0.5f)).normalizeLocal()); sun.setColor(ColorRGBA.White); rootNode.addLight(sun); DirectionalLightShadowFilter dlsf = new DirectionalLightShadowFilter(assetManager, 4096, 3); dlsf.setLight(sun); dlsf.setShadowIntensity(0.4f); dlsf.setShadowZExtend(256); FXAAFilter fxaa = new FXAAFilter(); BloomFilter bloom = new BloomFilter(BloomFilter.GlowMode.Objects); FilterPostProcessor fpp = new FilterPostProcessor(assetManager); fpp.addFilter(bloom); fpp.addFilter(dlsf); fpp.addFilter(fxaa); viewPort.addProcessor(fpp); } private BitmapText createTextUI(ColorRGBA color, float xPos, float yPos) { BitmapFont font = assetManager.loadFont("Interface/Fonts/Console.fnt"); BitmapText bmp = new BitmapText(font); bmp.setSize(font.getCharSet().getRenderedSize()); bmp.setLocalTranslation(xPos, settings.getHeight() - yPos, 0); bmp.setColor(color); guiNode.attachChild(bmp); return bmp; } } ```

I hope that interesting food for thought can arise from this topic to promote some updates and / or for everyone to learn something from a difficult challenge.