private void UpdateSelect(Vector2 mousePosition)
{
Ray ray = camera.ScreenPointToRay(new Vector3(mousePosition.x, camera.pixelHeight - mousePosition.y, 0));
Vector3 startPos = ray.origin + halfSpaceSize;
Vector3 dir = ray.direction;
if (selectBlockStage == SelectBlockStage.SelectStart)
{
RayCastRestult rlt = rtm.rayCast(startPos, dir, 200, RayCastBlockType.All);
bShowPreview = rlt.bHit;
if (rlt.bHit)
{
normalIndex = (Face)rlt.hitFaceIndex;
Vector3 hitPos = startPos + dir * (rlt.hitLength + 0.001f);
float gx = (int)(hitPos.x / Const.BlockSize);
float gy = (int)(hitPos.y / Const.BlockSize);
float gz = (int)(hitPos.z / Const.BlockSize);
if (curOperator == Operator.AddBlock)
{
selectedBlockPosStart = new Vector3(gx, gy, gz);
selectedBlockPosEnd2D = selectedBlockPosStart;
previewBlockPosStart = new Vector3(gx, gy, gz) + Const.getFaceNormal(rlt.hitFaceIndex) * Const.BlockSize;
previewBlockPosEnd2D = previewBlockPosStart;
previewBlockPosEnd3D = previewBlockPosEnd2D;
}
else if (curOperator == Operator.DeleteBlock)
{
selectedBlockPosStart = new Vector3(gx, gy, gz);
selectedBlockPosEnd2D = selectedBlockPosStart;
selectedBlockPosEnd3D = selectedBlockPosEnd2D;
}
}
else
{
normalIndex = Face.FNI_y1;
Vector3 faceNormal = Vector3.up; //表面法线
float camToFace = startPos.y - halfSpaceSize.y; //摄像机到表面的垂直线
float factor = Vector3.Dot(-faceNormal, dir);
if (factor > 0.0001)
{
Vector3 hitPos = startPos + dir * (camToFace / factor + 0.001f);
float gx = (int)(hitPos.x / Const.BlockSize);
float gy = (int)(hitPos.y / Const.BlockSize);
float gz = (int)(hitPos.z / Const.BlockSize);
if (curOperator == Operator.AddBlock)
{
previewBlockPosStart = new Vector3(gx, gy, gz) + Vector3.up * Const.BlockSize;
previewBlockPosEnd2D = previewBlockPosStart;
previewBlockPosEnd3D = previewBlockPosEnd2D;
}
else if (curOperator == Operator.DeleteBlock)
{
selectedBlockPosStart = new Vector3(gx, gy, gz);
selectedBlockPosEnd2D = selectedBlockPosStart;
selectedBlockPosEnd3D = selectedBlockPosEnd2D;
}
bShowPreview = true;
}
else
{
bShowPreview = false;
}
}
}
else if (selectBlockStage == SelectBlockStage.SelectEnd2D)
{
if (curOperator == Operator.AddBlock)
{
//计算摄像机在操作平面上的投影点
Vector3 camToStart = previewBlockPosStart - startPos; //摄像机到开始点
Vector3 faceNormal = Const.getFaceNormal((int)normalIndex); //表面法线
float camToFace = Vector3.Dot(camToStart, -faceNormal) + 0.49999f; //摄像机到表面的垂直线
float factor = Vector3.Dot(-faceNormal, dir);
if (factor > 0.0001)
{
previewBlockPosEnd2D = startPos + dir * (camToFace / factor);
previewBlockPosEnd3D = previewBlockPosEnd2D;
//Debug.Log(previewBlockPosEnd.ToString());
bShowPreview = true;
}
else
{
bShowPreview = false;
}
}
else if (curOperator == Operator.DeleteBlock)
{
//计算摄像机在操作平面上的投影点
Vector3 camToStart = selectedBlockPosStart - startPos; //摄像机到开始点
Vector3 faceNormal = Const.getFaceNormal((int)normalIndex); //表面法线
float camToFace = Vector3.Dot(camToStart, -faceNormal) + 0.49999f;
float factor = Vector3.Dot(-faceNormal, dir);
if (factor > 0.0001)
{
selectedBlockPosEnd2D = startPos + dir * (camToFace / factor);
selectedBlockPosEnd3D = selectedBlockPosEnd2D;
bShowPreview = true;
}
else
{
bShowPreview = false;
}
}
}
else if (selectBlockStage == SelectBlockStage.SelectEnd3D)
{
if (curOperator == Operator.AddBlock)
{
//计算摄像机在操作平面上的投影点
Vector3 camToStart = previewBlockPosEnd2D - startPos; //摄像机到开始点
Vector3 faceNormal = Const.getFaceNormal((int)normalIndex); //击中法线
Vector3 right = Vector3.Cross(faceNormal, dir).normalized;
Vector3 forward = Vector3.Cross(right, faceNormal); //操作平面的法线
float factor = Vector3.Dot(dir, forward);
if (factor > 0.0001)
{
bShowPreview = true;
Vector3 hitPos = startPos + dir * Vector3.Dot(camToStart, forward) / factor;
Vector3 offset = faceNormal * Vector3.Dot((hitPos - previewBlockPosEnd2D), faceNormal);
previewBlockPosEnd3D = previewBlockPosEnd2D + offset;
}
else
{
bShowPreview = false;
}
}
else if (curOperator == Operator.DeleteBlock)
{
//计算摄像机在操作平面上的投影点
Vector3 camToStart = selectedBlockPosEnd2D - startPos; //摄像机到开始点
Vector3 faceNormal = Const.getFaceNormal((int)normalIndex); //击中法线
Vector3 right = Vector3.Cross(faceNormal, dir).normalized;
Vector3 forward = Vector3.Cross(right, faceNormal); //操作平面的法线
float factor = Vector3.Dot(dir, forward);
if (factor > 0.0001)
{
bShowPreview = true;
Vector3 hitPos = startPos + dir * Vector3.Dot(camToStart, forward) / factor;
Vector3 offset = faceNormal * Vector3.Dot((hitPos - selectedBlockPosEnd2D), faceNormal);
selectedBlockPosEnd3D = selectedBlockPosEnd2D + offset;
}
else
{
bShowPreview = false;
}
}
}
}
