Question

我正在将Box2d或plank.js的javascript版本与我自己的库（空间坐标）集成在一起。我有一个列表/数组，在调用 world.step 之前，每个循环都会不断更改。（之所以需要限制world.step中更新的内容，是因为世界需要无限远）

我尝试在 world.step 函数中传递该主体数组，但是没有入口点。

我还考虑过尝试更改某些变量，例如this.m_bodyList或b.getNext（），但我认为这些无效。

我什至考虑过添加主体，然后调用world.step然后删除这些主体。

world.step 函数如下所示：

World.prototype.step = function(timeStep, velocityIterations, positionIterations) {
    if ((velocityIterations | 0) !== velocityIterations) {
        // TODO: remove this in future
        velocityIterations = 0;
    }
    velocityIterations = velocityIterations || this.m_velocityIterations;
    positionIterations = positionIterations || this.m_positionIterations;
    // TODO: move this to testbed
    this.m_stepCount++;
    // If new fixtures were added, we need to find the new contacts.
    if (this.m_newFixture) {
        this.findNewContacts();
        this.m_newFixture = false;
    }
    this.m_locked = true;
    s_step.reset(timeStep);
    s_step.velocityIterations = velocityIterations;
    s_step.positionIterations = positionIterations;
    s_step.warmStarting = this.m_warmStarting;
    s_step.blockSolve = this.m_blockSolve;
    // Update contacts. This is where some contacts are destroyed.
    this.updateContacts();
    // Integrate velocities, solve velocity constraints, and integrate positions.
    if (this.m_stepComplete && timeStep > 0) {
        this.m_solver.solveWorld(s_step);
        // Synchronize fixtures, check for out of range bodies.
        for (var b = this.m_bodyList; b; b = b.getNext()) {
            // If a body was not in an island then it did not move.
            if (b.m_islandFlag == false) {
                continue;
            }
            if (b.isStatic()) {
                continue;
            }
            // Update fixtures (for broad-phase).
            b.synchronizeFixtures(); 
        }
        // Look for new contacts.
        this.findNewContacts();
    }
    // Handle TOI events.
    if (this.m_continuousPhysics && timeStep > 0) {
        this.m_solver.solveWorldTOI(s_step);
    }
    if (this.m_clearForces) {
        this.clearForces();
    }
    this.m_locked = false;
};

我只需要world.step来仅处理库中摄像机可以看到的当前物体列表上的物体/碰撞。

编辑：

有没有办法使自定义功能仅更新一个主体？

如何控制world.step函数中更新的物体列表

0 个答案: