Custom Rendering for Overlay, Am not satisfied yet

common/src/main/kotlin/com/cobblemon/mod/common/client/render/block/GrottoBlockRenderer.kt

@@ -1,7 +1,9 @@
 package com.cobblemon.mod.common.client.render.block
 
 import com.cobblemon.mod.common.block.entity.GrottoBlockEntity
+import com.cobblemon.mod.common.util.cobblemonResource
 import com.mojang.blaze3d.vertex.PoseStack
+import com.mojang.blaze3d.vertex.VertexConsumer
 import net.minecraft.client.Minecraft
 import net.minecraft.client.renderer.LevelRenderer
 import net.minecraft.client.renderer.MultiBufferSource
@@ -12,6 +14,7 @@ import net.minecraft.client.renderer.texture.OverlayTexture
 import net.minecraft.world.level.block.state.BlockState
 
 class GrottoBlockRenderer(ctx: BlockEntityRendererProvider.Context) : BlockEntityRenderer<GrottoBlockEntity> {
+
     override fun render(
         entity: GrottoBlockEntity,
         partialTicks: Float,
@@ -24,6 +27,7 @@ class GrottoBlockRenderer(ctx: BlockEntityRendererProvider.Context) : BlockEntit
         val level = entity.level ?: return
 
         poseStack.pushPose()
+
         Minecraft.getInstance().blockRenderer.renderBatched(
             stateToRender,
             entity.blockPos,
@@ -33,7 +37,90 @@ class GrottoBlockRenderer(ctx: BlockEntityRendererProvider.Context) : BlockEntit
             true,
             level.random
         )
-        poseStack.popPose()
 
+        val overlayTexture = cobblemonResource("textures/block/grotto_overlay.png")
+        val overlayRenderType = RenderType.entityTranslucentCull(overlayTexture)
+        val overlayBuffer = bufferSource.getBuffer(overlayRenderType)
+
+        renderOverlayCube(
+            poseStack,
+            overlayBuffer,
+            packedLight,
+            OverlayTexture.NO_OVERLAY
+        )
+
+        poseStack.popPose()
     }
 }
+
+fun renderOverlayCube(
+    poseStack: PoseStack,
+    buffer: VertexConsumer,
+    light: Int,
+    overlay: Int
+) {
+    val matrix = poseStack.last().pose()
+    val min = -0.001f
+    val max = 1.001f
+
+    // Front (Z+)
+    buffer.addVertex(matrix, min, min, max).setColor(255, 255, 255, 128)
+        .setUv(min, max).setOverlay(overlay).setLight(light).setNormal(min, min, max)
+    buffer.addVertex(matrix, max, min, max).setColor(255, 255, 255, 128)
+        .setUv(max, max).setOverlay(overlay).setLight(light).setNormal(min, min, max)
+    buffer.addVertex(matrix, max, max, max).setColor(255, 255, 255, 128)
+        .setUv(max, min).setOverlay(overlay).setLight(light).setNormal(min, min, max)
+    buffer.addVertex(matrix, min, max, max).setColor(255, 255, 255, 128)
+        .setUv(min, min).setOverlay(overlay).setLight(light).setNormal(min, min, max)
+
+    // Back (Z-)
+    buffer.addVertex(matrix, max, min, min).setColor(255, 255, 255, 128)
+        .setUv(min, max).setOverlay(overlay).setLight(light).setNormal(min, min, -max)
+    buffer.addVertex(matrix, min, min, min).setColor(255, 255, 255, 128)
+        .setUv(max, max).setOverlay(overlay).setLight(light).setNormal(min, min, -max)
+    buffer.addVertex(matrix, min, max, min).setColor(255, 255, 255, 128)
+        .setUv(max, min).setOverlay(overlay).setLight(light).setNormal(min, min, -max)
+    buffer.addVertex(matrix, max, max, min).setColor(255, 255, 255, 128)
+        .setUv(min, min).setOverlay(overlay).setLight(light).setNormal(min, min, -max)
+
+    // Left (X-)
+    buffer.addVertex(matrix, min, min, min).setColor(255, 255, 255, 128)
+        .setUv(min, max).setOverlay(overlay).setLight(light).setNormal(-max, min, min)
+    buffer.addVertex(matrix, min, min, max).setColor(255, 255, 255, 128)
+        .setUv(max, max).setOverlay(overlay).setLight(light).setNormal(-max, min, min)
+    buffer.addVertex(matrix, min, max, max).setColor(255, 255, 255, 128)
+        .setUv(max, min).setOverlay(overlay).setLight(light).setNormal(-max, min, min)
+    buffer.addVertex(matrix, min, max, min).setColor(255, 255, 255, 128)
+        .setUv(min, min).setOverlay(overlay).setLight(light).setNormal(-max, min, min)
+
+    // Right (X+)
+    buffer.addVertex(matrix, max, min, max).setColor(255, 255, 255, 128)
+        .setUv(min, max).setOverlay(overlay).setLight(light).setNormal(max, min, min)
+    buffer.addVertex(matrix, max, min, min).setColor(255, 255, 255, 128)
+        .setUv(max, max).setOverlay(overlay).setLight(light).setNormal(max, min, min)
+    buffer.addVertex(matrix, max, max, min).setColor(255, 255, 255, 128)
+        .setUv(max, min).setOverlay(overlay).setLight(light).setNormal(max, min, min)
+    buffer.addVertex(matrix, max, max, max).setColor(255, 255, 255, 128)
+        .setUv(min, min).setOverlay(overlay).setLight(light).setNormal(max, min, min)
+
+    // Top (Y+)
+    buffer.addVertex(matrix, min, max, max).setColor(255, 255, 255, 128)
+        .setUv(min, max).setOverlay(overlay).setLight(light).setNormal(min, max, min)
+    buffer.addVertex(matrix, max, max, max).setColor(255, 255, 255, 128)
+        .setUv(max, max).setOverlay(overlay).setLight(light).setNormal(min, max, min)
+    buffer.addVertex(matrix, max, max, min).setColor(255, 255, 255, 128)
+        .setUv(max, min).setOverlay(overlay).setLight(light).setNormal(min, max, min)
+    buffer.addVertex(matrix, min, max, min).setColor(255, 255, 255, 128)
+        .setUv(min, min).setOverlay(overlay).setLight(light).setNormal(min, max, min)
+
+    // Bottom (Y-)
+    buffer.addVertex(matrix, min, min, min).setColor(255, 255, 255, 128)
+        .setUv(min, max).setOverlay(overlay).setLight(light).setNormal(min, -max, min)
+    buffer.addVertex(matrix, max, min, min).setColor(255, 255, 255, 128)
+        .setUv(max, max).setOverlay(overlay).setLight(light).setNormal(min, -max, min)
+    buffer.addVertex(matrix, max, min, max).setColor(255, 255, 255, 128)
+        .setUv(max, min).setOverlay(overlay).setLight(light).setNormal(min, -max, min)
+    buffer.addVertex(matrix, min, min, max).setColor(255, 255, 255, 128)
+        .setUv(min, min).setOverlay(overlay).setLight(light).setNormal(min, -max, min)
+}
+

common/src/main/resources/assets/cobblemon/models/block/grotto_block.json

@@ -1,5 +1,5 @@
 {
-  "parent": "block/cube_all",
+  "parent": "minecraft:block/air",
   "textures": {
     "all": "minecraft:block/barrier"
   },