[[1.16.1] Custom Dimension different sky]

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[Transparency in GUI]

I found the solution. The error was not even in the code I put up, turns out the order in which the IVertexBuilder are created matters. (Create solid THEN translucent for good result)

IVertexBuilder

[Transparency in GUI]

I am attempting to create a semi transparent model that will appear in a GUI. However, you can see behind the GUI with it and not behind in the GUI

    @SubscribeEvent
    public static void onTextureStitch(TextureStitchEvent.Pre event){
        if(event.getMap().getTextureLocation().equals(AtlasTexture.LOCATION_BLOCKS_TEXTURE)){
            event.addSprite(new ResourceLocation(MOD_ID, "planets/default"));
        }
    }

@Mod.EventBusSubscriber(modid=Main.MOD_ID, bus = Mod.EventBusSubscriber.Bus.MOD)
public class GUIBlockScreen extends ContainerScreen<GUIBlockContainer> {
    
  public GUIBlockScreen(GUIBlockContainer screenContainer, PlayerInventory inv, ITextComponent titleIn) {
        super(screenContainer, inv, titleIn);
    }

    @Override
    protected void drawGuiContainerBackgroundLayer(float partialTicks, int mouseX, int mouseY) {
        RenderSystem.color4f(1.0F, 1.0F, 1.0F, 1.0F);
        drawEntityOnScreen(this.width / 2, this.height / 2, (int) pow(30 - this.zoom / 3, 2 ));
    }

    public void drawOnScreen(int posX, int posY, int scale) {
        RenderSystem.pushMatrix();
      	// I have tried all of these but it dosn't seem to do anything
        // RenderSystem.enableBlend();
        // RenderSystem.enableTexture();
        // RenderSystem.enableDepthTest();
        // RenderSystem.disableCull();
        // RenderSystem.enableRescaleNormal();
        // RenderSystem.enableAlphaTest();
        // RenderSystem.defaultAlphaFunc();
        // RenderSystem.enableBlend();
        // RenderSystem.blendFunc(GlStateManager.SourceFactor.SRC_ALPHA, GlStateManager.DestFactor.ONE_MINUS_SRC_ALPHA);
        // RenderSystem.defaultBlendFunc();

        RenderSystem.translatef((float)posX, (float)posY, -1050.0F);
        RenderSystem.scalef(0.12F, 0.12F, 0.12F);

        MatrixStack matrixstack = new MatrixStack();

        IRenderTypeBuffer.Impl irendertypebuffer$impl = Minecraft.getInstance().getRenderTypeBuffers().getBufferSource();
      
      	IVertexBuilder vertexBuilder = irendertypebuffer$impl.getBuffer(RenderType.getTranslucent());

      	Material material = new Material(AtlasTexture.LOCATION_BLOCKS_TEXTURE, new ResourceLocation(Main.MOD_ID, 		"planets/defaulttransparency"));

		drawCube(new Vec3d(0.5, 0, 0), new Vec3d(0, 0.5, 0), new Vec3d(0, 0, 0.5), matrixstack, vertexBuilder, this.material, 0.3F);

        irendertypebuffer$impl.finish();

        RenderSystem.popMatrix();
    }
}

	private static void add(IVertexBuilder renderer, Matrix4f matrixPos, Vec3d A, Vec3d N, float u, float v, float opacity) {
        renderer.pos(matrixPos, (float) A.x, (float) A.y, (float) A.z)
                .color(1.0F, 1.0F, 1.0F, opacity)
                .tex(u, v)
                .lightmap(0, 240)
                .normal((float) N.x, (float) N.y, (float) N.z)
                .endVertex();
    }

    private static void square(IVertexBuilder renderer, Matrix4f matrixPos, Vec3d A, Vec3d B, Vec3d C, Material material, float opacity) {
        Vec3d N = A.crossProduct(B).normalize();
        float u = material.getSprite().getMinU();
        float U = material.getSprite().getMaxU();
        float v = material.getSprite().getMinV();
        float V = material.getSprite().getMaxV();
        add(renderer, matrixPos, C, N, u, v, opacity);
        add(renderer, matrixPos, A.add(C), N, U, v, opacity);
        add(renderer, matrixPos, A.add(B).add(C), N, U, V, opacity);
        add(renderer, matrixPos, B.add(C), N, u, V, opacity);
    }

    public static void drawCube(Vec3d A, Vec3d B, Vec3d C,
                                MatrixStack matrixstack, IVertexBuilder renderBuffer, Material material, float opacity) {
        // retrieves a position matrix
        Matrix4f matrixPos = matrixstack.getLast().getMatrix();

        // draws the 6 sides
        square(renderBuffer, matrixPos, A, B, Vec3d.ZERO, material, opacity);
        square(renderBuffer, matrixPos, B, A, C, material, opacity);

        square(renderBuffer, matrixPos, C, A, Vec3d.ZERO, material, opacity);
        square(renderBuffer, matrixPos, A, C, B, material, opacity);

        square(renderBuffer, matrixPos, B, C, Vec3d.ZERO, material, opacity);
        square(renderBuffer, matrixPos, C, B, A, material, opacity);
    }