C++ (Cpp) GetRandomVector Examples

Example #1

File: View.cpp Project: joewan/pycmake

void CView::ProcessShakeSmooth_DoShaking( SShake* pShake, float frameTime)
{
	if (pShake->nextShake <= 0.0f)
	{
		pShake->nextShake = pShake->frequency;

		pShake->startShake            = pShake->goalShake;
		pShake->startShakeSpeed       = pShake->goalShakeSpeed;
		pShake->startShakeVector      = pShake->goalShakeVector;
		pShake->startShakeVectorSpeed = pShake->goalShakeVectorSpeed;

		GetRandomQuat(pShake->goalShake, pShake);
		GetRandomQuat(pShake->goalShakeSpeed, pShake);
		GetRandomVector(pShake->goalShakeVector, pShake);
		GetRandomVector(pShake->goalShakeVectorSpeed, pShake);

		if (pShake->flip)
		{
			pShake->goalShake.Invert();
			pShake->goalShakeSpeed.Invert();
			pShake->goalShakeVector      = -pShake->goalShakeVector;
			pShake->goalShakeVectorSpeed = -pShake->goalShakeVectorSpeed;
		}

		if (pShake->doFlip)
			pShake->flip = !pShake->flip;

	}

	pShake->nextShake -= frameTime;

	float t = (pShake->frequency - pShake->nextShake) / pShake->frequency;
	CubeInterpolateQuat(t, pShake);
	CubeInterpolateVector(t, pShake);
}

Example #2

File: snow.cpp Project: followDreamLgx/Snake

/*
1. 将粒子复活并将其置入粒子源处
2. 获取任意方向，大小在规定范围内的速度，并将其规范化，以便绘制出球形区域
3. 设置粒子的颜色为随机颜色
4. 设置粒子的生命周期为2s
*/
void FIRE::reset_particle(ATTRIBUTE *attribute)
{
	attribute->_alive  = true;
	attribute->_position = _origin;

	D3DXVECTOR3 min = D3DXVECTOR3(-1.0f, -1.0f, -1.0f);
	D3DXVECTOR3 max = D3DXVECTOR3( 1.0f,  1.0f,  1.0f);
	//获取任意方向的速度
	GetRandomVector(
		&attribute->_velocity,
		&min,
		&max);

	//将速度规范化才能绘制出球形
	D3DXVec3Normalize(
		&attribute->_velocity,
		&attribute->_velocity);

	attribute->_velocity *= 100.0f;
	//将粒子设置为一个随机的颜色
	attribute->_color = D3DXCOLOR(
		GetRandomFloat(0.0f, 1.0f),
		GetRandomFloat(0.0f, 1.0f),
		GetRandomFloat(0.0f, 1.0f),
		1.0f);

	attribute->_age      = 0.0f;
	attribute->_life_time = 2.0f; // lives for 2 seconds
}

Example #3

File: snow.cpp Project: followDreamLgx/Snake

//本函数没错
//设置粒子属性						P245
//在指定的外界体内创建了具有随机xz坐标的雪花粒子，并将粒子的y坐标设为
//外接体高度值，赋予雪花一定向左下飘的速度
void SNOW::reset_particle(ATTRIBUTE *attribute)
{
	attribute->_alive = true;
	GetRandomVector(&attribute->_position,			//设置雪花飘落的速度大小以及方向
		&_box._min,
		&_box._max);

	attribute->_position.y = _box._max.y;
	attribute->_velocity.x = GetRandomFloat(0.0f,1.0f) * (-3.0f);
	attribute->_velocity.y = GetRandomFloat(0.0f,1.0f) * (-10.0f);
	attribute->_velocity.z = 0.0f;

	attribute->_color = WHITE;						//设定雪花的颜色（实际上雪花的颜色是纹理的颜色）
}

Example #4

File: Balls0.cpp Project: BillyKim/directxcode

void Balls::ResetParticle(Particle* particle, D3DXVECTOR3* pos)
{
	particle->isLive = true ;
	particle->age = 0.0f ;
	particle->lifeTime = 5.0f ; /*GetRandomFloat(0.1f, 1.0f) ;*/
	particle->position = *pos ;

	D3DXVECTOR3 min = D3DXVECTOR3(-1.0f, -1.0f, -1.0f);
	D3DXVECTOR3 max = D3DXVECTOR3( 1.0f,  1.0f, 1.0f);
	GetRandomVector(&particle->velocity, &min, &max);

	// normalize to make spherical
	D3DXVec3Normalize(&particle->velocity, &particle->velocity);
	particle->velocity.z = 0.0f;

	// Normalize gravity
	D3DXVec3Normalize(&particle->gravity, &particle->gravity);
}

Example #5

File: snowParticle.cpp Project: yingyuewuhen/D3D

//初始化粒子
void SnowParticle::ResetParticle(Particle* particle)
{
	particle->age = 0.0f;
	particle->isLive = true;
	particle->lifeTime = GetRandomFloat(2.0f, 10.0f);
	particle->color = D3DCOLOR_RGBA(rand() % 255, rand() % 255, rand() % 255, rand() % 255);
	particle->colorFade = D3DXCOLOR(D3DCOLOR_RGBA(0, 0, 0, 0));
	
	D3DXVECTOR3 minVec(0, 50, 0);
	D3DXVECTOR3 maxVec(50, 70, 50);
	D3DXVECTOR3 pos;
	GetRandomVector(&pos, &minVec, &maxVec);
	particle->position = pos;
	particle->initVelocity = D3DXVECTOR3(GetRandomFloat(0, 1.0f),
		GetRandomFloat(-1.0f, 0.0f), GetRandomFloat(0.0f, 1.0f));

	particle->velocity = D3DXVECTOR3(GetRandomFloat(-1.0f, 1.0f),
		GetRandomFloat(-1.0f, 0.0f), GetRandomFloat(-1.0f, 1.0f));

}