I've been trying to draw boxes inside of the minecraft world for many frustrating hours in 1.12.2 and I'm really struggling. My first thought was to try making a world2screen function and drawing there but this has been difficult and buggy

I saw many people using the

RenderWorldLastEvent

event but I'm not sure how it works.

 

The bottom of this post has exactly what I want but I couldn't find 1.12.2 equivalents of these. (code below)

@EventBusSubscriber(Dist.CLIENT)
public class SpellRenderEventSubscriber
{	
	@SubscribeEvent
	public static void worldRender(RenderWorldLastEvent event)
	{
		Impl buffer = Minecraft.getInstance().renderBuffers().bufferSource();
		IVertexBuilder builder = buffer.getBuffer(SpellRender.QUADS); //SpellRender.QUADS is a personal RenderType, of VertexFormat POSITION_COLOR.
		
		MatrixStack stack = event.getMatrixStack();
		
		stack.pushPose();
		
		Vector3d cam = Minecraft.getInstance().gameRenderer.getMainCamera().getPosition();
		stack.translate(-cam.x, -cam.y, -cam.z);
		
		Matrix4f mat = stack.last().pose();
		
		builder.vertex(mat, 0, 57, 0).color(0, 255, 255, 150).endVertex();
		builder.vertex(mat, 1, 57, 0).color(0, 255, 255, 150).endVertex();
		builder.vertex(mat, 1, 58, 0).color(0, 255, 255, 150).endVertex();
		builder.vertex(mat, 0, 58, 0).color(0, 255, 255, 150).endVertex();
		
		stack.popPose();
		
		buffer.endBatch(SpellRender.QUADS);
	}
}

If anyone could help me translate this code to 1.12.2 it would be greatly appreciated!!

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