I'm trying to render shape in world similar to mc's world border, but I'm getting some weird issues with colors. When I rotate in specific angle, the color turns black and otherwise it's just plain blue. I cannot figure this out at all, and I have no idea what I'm doing wrong. Anyway, I'd be very happy if someone offered help. So there's the render code: 

Spoiler

    @SubscribeEvent
    public void renderBlueZone(RenderWorldLastEvent e) {
        Minecraft mc = Minecraft.getMinecraft();
        World world = mc.world;
        IGameData gameData = world.getCapability(IGameData.GameDataProvider.GAMEDATA, null);
        Game game = gameData.getCurrentGame();
        if (!gameData.isPlaying() || gameData.isInactiveGame()) {
            return;
        }
        BlueZone zone = game.zone;
        if (zone == null) {
            return;
        }
        EntityPlayerSP player = mc.player;
        double maxClientRenderDist = mc.gameSettings.renderDistanceChunks * 16;
        if (isCloseToBorder(player, zone, maxClientRenderDist)) {
            float partialTicks = e.getPartialTicks();
            double interpolatedPlayerX = interpolate(player.posX, player.lastTickPosX, partialTicks);
            double interpolatedPlayerY = interpolate(player.posY, player.lastTickPosY, partialTicks);
            double interpolatedPlayerZ = interpolate(player.posZ, player.lastTickPosZ, partialTicks);
            int clientZoneColor = ConfigPMC.client.other.zoneColor;
            float a = 0.75F;
            float r = 0.0F;
            float g = 1.0F;
            float b = 1.0F;
            //actual rendering
            Tessellator tessellator = Tessellator.getInstance();
            BufferBuilder bufferBuilder = tessellator.getBuffer();

            GlStateManager.enableBlend();
            GlStateManager.color(1f, 1f, 1f);
            mc.getTextureManager().bindTexture(dummy);
            GlStateManager.pushMatrix();
            GlStateManager.alphaFunc(516, 0.1F);
            GlStateManager.enableAlpha();
            GlStateManager.disableCull();
            bufferBuilder.begin(7, DefaultVertexFormats.POSITION_COLOR);
            bufferBuilder.setTranslation(-interpolatedPlayerX, -interpolatedPlayerY, -interpolatedPlayerZ);
            double minRenderPosZ = Math.max(Math.floor(interpolatedPlayerZ - maxClientRenderDist), zone.minZ());
            double maxRenderPosZ = Math.min(Math.ceil(interpolatedPlayerZ + maxClientRenderDist), zone.maxZ());
            double minRenderPosX = Math.max(Math.floor(interpolatedPlayerX - maxClientRenderDist), zone.minX());
            double maxRenderPosX = Math.min(Math.ceil(interpolatedPlayerX + maxClientRenderDist), zone.maxX());
            if (interpolatedPlayerX > zone.maxX() - maxClientRenderDist) {
                bufferBuilder.pos(zone.maxX(), 256D, minRenderPosZ).color(r, g, b, a).endVertex();
                bufferBuilder.pos(zone.maxX(), 256D, maxRenderPosZ).color(r, g, b, a).endVertex();
                bufferBuilder.pos(zone.maxX(), 0D, maxRenderPosZ).color(r, g, b, a).endVertex();
                bufferBuilder.pos(zone.maxX(), 0D, minRenderPosZ).color(r, g, b, a).endVertex();
            }
            if(interpolatedPlayerX < zone.minX() + maxClientRenderDist) {
                bufferBuilder.pos(zone.minX(), 256D, minRenderPosZ).color(r, g, b, a).endVertex();
                bufferBuilder.pos(zone.minX(), 256D, maxRenderPosZ).color(r, g, b, a).endVertex();
                bufferBuilder.pos(zone.minX(), 0D, maxRenderPosZ).color(r, g, b, a).endVertex();
                bufferBuilder.pos(zone.minX(), 0D, minRenderPosZ).color(r, g, b, a).endVertex();
            }
            if(interpolatedPlayerZ > zone.maxZ() - maxClientRenderDist) {
                bufferBuilder.pos(minRenderPosX, 256D, zone.maxZ()).color(r, g, b, a).endVertex();
                bufferBuilder.pos(maxRenderPosX, 256D, zone.maxZ()).color(r, g, b, a).endVertex();
                bufferBuilder.pos(maxRenderPosX, 0D, zone.maxZ()).color(r, g, b, a).endVertex();
                bufferBuilder.pos(minRenderPosX, 0D, zone.maxZ()).color(r, g, b, a).endVertex();
            }
            if(interpolatedPlayerZ < zone.minZ() + maxClientRenderDist) {
                bufferBuilder.pos(minRenderPosX, 256D, zone.minZ()).color(r, g, b, a).endVertex();
                bufferBuilder.pos(maxRenderPosX, 256D, zone.minZ()).color(r, g, b, a).endVertex();
                bufferBuilder.pos(maxRenderPosX, 0D, zone.minZ()).color(r, g, b, a).endVertex();
                bufferBuilder.pos(minRenderPosX, 0D, zone.minZ()).color(r, g, b, a).endVertex();
            }

            tessellator.draw();
            bufferBuilder.setTranslation(0, 0, 0);
            GlStateManager.enableCull();
            GlStateManager.disableAlpha();
            GlStateManager.disableBlend();
            GlStateManager.popMatrix();
        }

 

 

And some images for reference:
 

Spoiler

https://prnt.sc/p5ufzd

https://prnt.sc/p5ug6n

 

Edited September 14, 20196 yr by Toma™
mark as solved

Nevermind, I just forgot to to call disableTexture2D function. That solved it.