DrawDebugLine will gradually appear

Development Rendering
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1

Hi.

I try to draw line and makes face and solid by DrawDebugLine.

But, DrawDebugLine looks like has several problem.

  1. appear slowly
  2. dirty rendering when overlapped them selves.

ref video.

ref func.

DrawDebugLine(pWorld, ptStt, ptEnd, FColor::Blue, false, -0.1f, SDPG_World, 0);

DrawDebugLine(pWorld, ptStt, ptEnd, FColor::Black, false, -0.1f, SDPG_World, 1.0f);

How can I solves this problems or another way to draw line?