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let billboard can rotate in the Z axis

This commit is contained in:
tangziwen 2014-12-04 15:19:41 +08:00
parent da8dc13601
commit 8605595a5b
1 changed files with 9 additions and 5 deletions
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14
cocos/3d/CCBillBoard.cpp
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@ -99,14 +99,12 @@ BillBoard* BillBoard::create(Mode mode)
void BillBoard::draw(Renderer *renderer, const Mat4 &transform, uint32_t flags)
{
auto camera = Camera::getVisitingCamera();
const Mat4& camWorldMat = camera->getNodeToWorldTransform();
if (memcmp(_camWorldMat.m, camWorldMat.m, sizeof(float) * 16) != 0 || memcmp(_mvTransform.m, transform.m, sizeof(float) * 16) != 0 || _modeDirty)
{
Vec3 anchorPoint(_anchorPointInPoints.x , _anchorPointInPoints.y , 0.0f);
Mat4 localToWorld = transform;
localToWorld.translate(anchorPoint);
Vec3 camDir;
switch (_mode)
{
@ -121,14 +119,20 @@ void BillBoard::draw(Renderer *renderer, const Mat4 &transform, uint32_t flags)
break;
}
_modeDirty = false;
if (camDir.length() < MATH_TOLERANCE)
{
camDir.set(camWorldMat.m[8], camWorldMat.m[9], camWorldMat.m[10]);
}
camDir.normalize();
static Vec3 upAxis(0.0f, 1.0f, 0.0f);
Quaternion rotationQuaternion;
this->getNodeToWorldTransform().getRotation(&rotationQuaternion);
// fetch the rotation angle of z
float rotationZ = atan2(2*(rotationQuaternion.w*rotationQuaternion.z + rotationQuaternion.x*rotationQuaternion.y),
(1 - 2* (rotationQuaternion.y*rotationQuaternion.y + rotationQuaternion.z *rotationQuaternion.z)));
Mat4 rotationMatrix;
rotationMatrix.setIdentity();
rotationMatrix.rotateZ(rotationZ);
Vec3 upAxis = Vec3(rotationMatrix.m[4],rotationMatrix.m[5],rotationMatrix.m[6]);
Vec3 x, y;
camWorldMat.transformVector(upAxis, &y);
Vec3::cross(camDir, y, &x);