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Try a Java version lower than 16

GatherDataEvent only fires during data runs, not during client or server runs

Actually it didn't quite work in the nether, but now it does. The reason I am posting this is, that if someone has the same problem in the future, they will find this. I searched for this on google for a good hour, but didn't find anything. New code: @SubscribeEvent public void render(RenderWorldLastEvent event) { IRenderTypeBuffer.Impl buffer = Minecraft.getInstance().getRenderTypeBuffers().getBufferSource(); IVertexBuilder builder = buffer.getBuffer(RenderType.LINES); MatrixStack matrixStack = event.getMatrixStack(); PlayerEntity player = Minecraft.getInstance().player; double x = player.lastTickPosX + (player.getPosX() - player.lastTickPosX) * event.getPartialTicks(); double y = player.lastTickPosY + (player.getPosY() - player.lastTickPosY) * event.getPartialTicks(); double z = player.lastTickPosZ + (player.getPosZ() - player.lastTickPosZ) * event.getPartialTicks(); matrixStack.push(); matrixStack.translate(-x, -y, -z); Matrix4f matrix = matrixStack.getLast().getMatrix(); builder.pos(matrix, 0, 0, 0).color(1f, 0, 0, 1f).endVertex(); builder.pos(matrix, 0, 256, 0).color(1f, 0, 0, 1f).endVertex(); matrixStack.pop(); RenderSystem.disableDepthTest(); buffer.finish(RenderType.LINES); }