[1.12.1]Tesselator transparent image not rendering background

[GiantNuker]

Hi, I'm making a Botania addon,

I've copied the code from the alfhaim portal renderer, but I really dislike the fact that behind the portal, no TESRs, water or particles render.

Is there any way to get around this?

Vazkii's render code:

Spoiler

public void renderIcon(int par1, int par2, TextureAtlasSprite par3Icon, int par4, int par5, int brightness) {
        Tessellator tessellator = Tessellator.getInstance();
        tessellator.getBuffer().begin(GL11.GL_QUADS, ClientProxy.POSITION_TEX_LMAP);
        tessellator.getBuffer().pos(par1 + 0, par2 + par5, 0).tex(par3Icon.getMinU(), par3Icon.getMaxV()).lightmap(brightness, brightness).endVertex();
        tessellator.getBuffer().pos(par1 + par4, par2 + par5, 0).tex(par3Icon.getMaxU(), par3Icon.getMaxV()).lightmap(brightness, brightness).endVertex();
        tessellator.getBuffer().pos(par1 + par4, par2 + 0, 0).tex(par3Icon.getMaxU(), par3Icon.getMinV()).lightmap(brightness, brightness).endVertex();
        tessellator.getBuffer().pos(par1 + 0, par2 + 0, 0).tex(par3Icon.getMinU(), par3Icon.getMinV()).lightmap(brightness, brightness).endVertex();
        tessellator.draw();
    }

I have never really used the Tesselator, so any help would be appreciated.  

[Draco18s]

https://bugs.mojang.com/browse/MC-9553