82 lines
2.8 KiB
C++
82 lines
2.8 KiB
C++
// Jolt Physics Library (https://github.com/jrouwe/JoltPhysics)
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// SPDX-FileCopyrightText: 2025 Jorrit Rouwe
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// SPDX-License-Identifier: MIT
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#pragma once
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// Jolt includes
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#include <Jolt/Physics/Collision/Shape/BoxShape.h>
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#include <Jolt/Physics/Body/BodyCreationSettings.h>
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// Local includes
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#include "PerformanceTestScene.h"
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#include "Layers.h"
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// A scene that creates the max number of bodies that Jolt supports and simulates them
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class MaxBodiesScene : public PerformanceTestScene
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{
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public:
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virtual const char * GetName() const override
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{
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return "MaxBodies";
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}
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virtual size_t GetTempAllocatorSizeMB() const override
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{
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return 8192;
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}
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virtual uint GetMaxBodies() const override
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{
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return PhysicsSystem::cMaxBodiesLimit;
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}
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virtual uint GetMaxBodyPairs() const override
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{
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return PhysicsSystem::cMaxBodyPairsLimit;
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}
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virtual uint GetMaxContactConstraints() const override
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{
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return PhysicsSystem::cMaxContactConstraintsLimit;
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}
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virtual void StartTest(PhysicsSystem &inPhysicsSystem, EMotionQuality inMotionQuality) override
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{
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BodyInterface &bi = inPhysicsSystem.GetBodyInterface();
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// Reduce the solver iteration count in the interest of performance
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PhysicsSettings settings = inPhysicsSystem.GetPhysicsSettings();
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settings.mNumVelocitySteps = 4;
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settings.mNumPositionSteps = 1;
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inPhysicsSystem.SetPhysicsSettings(settings);
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// Create the bodies
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uint num_bodies = inPhysicsSystem.GetMaxBodies();
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uint num_constraints = 0;
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BodyIDVector body_ids;
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body_ids.reserve(num_bodies);
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uint num_per_axis = uint(pow(float(num_bodies), 1.0f / 3.0f)) + 1;
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Vec3 half_extent = Vec3::sReplicate(0.5f);
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BodyCreationSettings bcs(new BoxShape(half_extent), RVec3::sZero(), Quat::sIdentity(), EMotionType::Dynamic, Layers::MOVING);
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bcs.mOverrideMassProperties = EOverrideMassProperties::MassAndInertiaProvided;
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bcs.mMassPropertiesOverride.SetMassAndInertiaOfSolidBox(2.0f * half_extent, 1000.0f);
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for (uint z = 0; z < num_per_axis && body_ids.size() < num_bodies; ++z)
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for (uint y = 0; y < num_per_axis && body_ids.size() < num_bodies; ++y)
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for (uint x = 0; x < num_per_axis && body_ids.size() < num_bodies; ++x)
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{
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// When we reach the limit of contact constraints, start placing the boxes further apart so they don't collide
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bcs.mPosition = RVec3(num_constraints < PhysicsSystem::cMaxContactConstraintsLimit? Real(x) : 2.0_r * x, 2.0_r * y, 2.0_r * z);
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body_ids.push_back(bi.CreateBody(bcs)->GetID());
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// From the 2nd box onwards in a row, we will get a contact constraint
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if (x > 0)
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++num_constraints;
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}
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// Add the bodies to the simulation
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BodyInterface::AddState state = bi.AddBodiesPrepare(body_ids.data(), num_bodies);
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bi.AddBodiesFinalize(body_ids.data(), num_bodies, state, EActivation::Activate);
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}
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};
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