Method createProceduralParticleSystem

Samples/ParticleGS/src/ParticleGS.cpp:49–102

    }

    void Sample_ParticleGS::createProceduralParticleSystem()
    {
        mParticleSystem = new ProceduralManualObject();
        mParticleSystem->_notifyManager(mSceneMgr);
        MaterialPtr mat = MaterialManager::getSingleton().getByName("Ogre/ParticleGS/Display", "General");
        mParticleSystem->setMaterial(mat);

        // Generate the geometry that will seed the particle system.
        ManualObject* particleSystemSeed = mSceneMgr->createManualObject("ParticleSeed");
        // This needs to be the initial launcher particle.
        particleSystemSeed->begin("Ogre/ParticleGS/Display", RenderOperation::OT_POINT_LIST);
        particleSystemSeed->position(0,0,0); // Position
        particleSystemSeed->textureCoord(1); // Timer
        particleSystemSeed->textureCoord(0); // Type
        particleSystemSeed->textureCoord(0,0,0); // Velocity
        particleSystemSeed->end();

        // Generate the RenderToBufferObject.
        auto r2vb = HardwareBufferManager::getSingleton().createRenderToVertexBuffer();
        r2vb->setRenderToBufferMaterialName("Ogre/ParticleGS/Generate");

        // Apply the random texture.
        TexturePtr randomTexture = RandomTools::generateRandomVelocityTexture();
        r2vb->getRenderToBufferMaterial()
            ->getTechnique(0)
            ->getPass(0)
            ->getTextureUnitState("RandomTexture")
            ->setTexture(randomTexture);

        r2vb->setOperationType(RenderOperation::OT_POINT_LIST);
        r2vb->setMaxVertexCount(16000);
        r2vb->setResetsEveryUpdate(false);
        VertexDeclaration* vertexDecl = r2vb->getVertexDeclaration();
        // Define input / feedback variables.
        size_t offset = 0;
        // Position
        offset += vertexDecl->addElement(0, offset, VET_FLOAT3, VES_POSITION).getSize();
        // Timer
        offset += vertexDecl->addElement(0, offset, VET_FLOAT1, VES_TEXTURE_COORDINATES, 0).getSize();
        // Type
        offset += vertexDecl->addElement(0, offset, VET_FLOAT1, VES_TEXTURE_COORDINATES, 1).getSize();
        // Velocity
        vertexDecl->addElement(0, offset, VET_FLOAT3, VES_TEXTURE_COORDINATES, 2).getSize();

        // Bind the two together.
        r2vb->setSourceRenderable(particleSystemSeed->getSections()[0]);
        mParticleSystem->setRenderToVertexBuffer(r2vb);

        // Set bounds.
        AxisAlignedBox aabb;
        aabb.setMinimum(-100,-100,-100);
        aabb.setMaximum(100,100,100);
        mParticleSystem->setBoundingBox(aabb);
    }

    void Sample_ParticleGS::testCapabilities(const RenderSystemCapabilities* caps)
    {