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Triedron disappear

hem's picture

I use Zbuffer triedron in my project.A phenomenon appeared.
When I zoom in my view,the triedron disappeared.

My codes as below:
//setup triedron
myView->TriedronDisplay(Aspect_TOTP_LEFT_LOWER, Quantity_NOC_PURPLE, 0.1, V3d_ZBUFFER);

//zoom my view

void DynamicZoom( int minX,int minY,int maxX,int maxY )

catch (exception& e)



Any one could provide me solution? Thank you very much