Screenshot glow effect problem

BingoBongo · April 22, 2018, 10:50am

Hi everyone. I have FloatRGB texture where some pixels have values more than 1. If it would be emissive color in material then I got glow effect like this:

To get glow effect I try to render texture with DefaultLit material in canvas by next material and code:

    material->SetTextureParameterValue(TEXT("texture"), m_screenshot.result);

    FCanvasTileItem tile(
      FVector2D::ZeroVector,
      material->GetRenderProxy(false),
      FVector2D(SCREENSHOT_SIZE, SCREENSHOT_SIZE),
      FVector2D(0.0f, 0.0f),
      FVector2D(1.0f, 1.0f));

finalTexture->InitCustomFormat(SCREENSHOT_SIZE, SCREENSHOT_SIZE, EPixelFormat::PF_B8G8R8A8, false);

    FCanvas* canvas=new FCanvas(finalTexture->GameThread_GetRenderTargetResource(), NULL, 0.0f, 0.0f, 0.0f, GMaxRHIFeatureLevel);
    canvas->DrawItem(tile, FVector2D::ZeroVector);
    canvas->Flush_GameThread();
    delete canvas;

But finalTexture doesn’t have glow effect:

What should I do?