Using Slate to draw a Grid Pattern to Screen - Any tips for faster line rendering?

[spiez]

@DennyR;432662

I think you are confusing wireframe with line drawing. In fact gpu wireframes are just meshes with vertex buffer information that have a different render option set in DirectX or OpenGL. The reason that wireframes are so fast, is that the meshes already live on the gpu and only have to be put out as rendered image. That is what the gpu does best.

I think the largest problem is, that your lines live on both sides, cpu and gpu. Sending information across slows stuff down tremendously.
A mesh is the only way to solve that problem, imho.

Well, the clipping issue on the other hand - no clue about that

OpenGL/DirectX have dedicated operations for drawing lines, I’ve used those methods to draw millions of lines on mobile devices with incredible performance even on low-end devices.

https://www.opengl.org/sdk/docs/man3/xhtml/glDrawArrays.xml
GL_LINE_STRIP and so on…

Ok, I’ve digged a bit into slate implementation, Epic is actually rendering with GL_LINES if you disable antialiasing on DrawLines(), the magic is in ElementBatcher.cpp, method AddLineElement().