The exception must have something to do with the item rendering. In the inventory it works fine, but as soon as I drop the item or try to look at it in F5, the game crashes with the following error:

java.lang.IllegalStateException: Pose stack not empty
	at net.minecraft.client.renderer.LevelRenderer.checkPoseStack(LevelRenderer.java:1430) ~[forge-1.19.2-43.1.1_mapped_official_1.19.2-recomp.jar%23183!/:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A}
	at net.minecraft.client.renderer.LevelRenderer.renderLevel(LevelRenderer.java:1229) ~[forge-1.19.2-43.1.1_mapped_official_1.19.2-recomp.jar%23183!/:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A}
	at net.minecraft.client.renderer.GameRenderer.renderLevel(GameRenderer.java:1068) ~[forge-1.19.2-43.1.1_mapped_official_1.19.2-recomp.jar%23183!/:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A}
	at net.minecraft.client.renderer.GameRenderer.render(GameRenderer.java:840) ~[forge-1.19.2-43.1.1_mapped_official_1.19.2-recomp.jar%23183!/:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A}
	at net.minecraft.client.Minecraft.runTick(Minecraft.java:1115) ~[forge-1.19.2-43.1.1_mapped_official_1.19.2-recomp.jar%23183!/:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A}
	at net.minecraft.client.Minecraft.run(Minecraft.java:700) ~[forge-1.19.2-43.1.1_mapped_official_1.19.2-recomp.jar%23183!/:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A}
	at net.minecraft.client.main.Main.run(Main.java:212) ~[forge-1.19.2-43.1.1_mapped_official_1.19.2-recomp.jar%23183!/:?] {re:classloading,pl:runtimedistcleaner:A}
	at net.minecraft.client.main.Main.main(Main.java:51) ~[forge-1.19.2-43.1.1_mapped_official_1.19.2-recomp.jar%23183!/:?] {re:classloading,pl:runtimedistcleaner:A}
	at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:?] {}
	at jdk.internal.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:?] {}
	at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:?] {}
	at java.lang.reflect.Method.invoke(Unknown Source) ~[?:?] {}
	at net.minecraftforge.fml.loading.targets.ForgeClientUserdevLaunchHandler.lambda$launchService$0(ForgeClientUserdevLaunchHandler.java:25) ~[fmlloader-1.19.2-43.1.1.jar%2395!/:?] {}
	at cpw.mods.modlauncher.LaunchServiceHandlerDecorator.launch(LaunchServiceHandlerDecorator.java:30) [modlauncher-10.0.8.jar%23108!/:?] {}
	at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:53) [modlauncher-10.0.8.jar%23108!/:?] {}
	at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:71) [modlauncher-10.0.8.jar%23108!/:?] {}
	at cpw.mods.modlauncher.Launcher.run(Launcher.java:106) [modlauncher-10.0.8.jar%23108!/:?] {}
	at cpw.mods.modlauncher.Launcher.main(Launcher.java:77) [modlauncher-10.0.8.jar%23108!/:?] {}
	at cpw.mods.modlauncher.BootstrapLaunchConsumer.accept(BootstrapLaunchConsumer.java:26) [modlauncher-10.0.8.jar%23108!/:?] {}
	at cpw.mods.modlauncher.BootstrapLaunchConsumer.accept(BootstrapLaunchConsumer.java:23) [modlauncher-10.0.8.jar%23108!/:?] {}
	at cpw.mods.bootstraplauncher.BootstrapLauncher.main(BootstrapLauncher.java:141) [bootstraplauncher-1.1.2.jar:?] {}


A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------

-- Head --
Thread: Render thread
Stacktrace:
	at net.minecraft.client.renderer.LevelRenderer.checkPoseStack(LevelRenderer.java:1430) ~[forge-1.19.2-43.1.1_mapped_official_1.19.2-recomp.jar%23183!/:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A}
	at net.minecraft.client.renderer.LevelRenderer.renderLevel(LevelRenderer.java:1229) ~[forge-1.19.2-43.1.1_mapped_official_1.19.2-recomp.jar%23183!/:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A}
	at net.minecraft.client.renderer.GameRenderer.renderLevel(GameRenderer.java:1068) ~[forge-1.19.2-43.1.1_mapped_official_1.19.2-recomp.jar%23183!/:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A}

Below what I believe the relevant code is:

// Inside my custom BakedModel
@Override
public BakedModel applyTransform(TransformType transformType, PoseStack poseStack, boolean applyLeftHandTransform) {
  Transformation transformation = VerticalSlabPerspectiveTransformer.getTransformation(transformType);
  if (!transformation.isIdentity()) {
    transformation.push(poseStack);
  }
  return this;
}

And in my VerticalSlabPerspectiveTransformer class:

public class VerticalSlabPerspectiveTransformer {
  /**
   * Map of all the Vertical Slab Item {@link Transformation transformations} associated with their respective {@link TransformType}.
   */
  private static final Map<TransformType, Transformation> TRANSFORMATIONS = Map.ofEntries(
    entry(TransformType.GUI, getTransformation(new Vector3f(0.1F, -0.05F, 0), new Vector3f(30, 45, 0), new Vector3f(0.625F, 0.625F, 0.625F))),
    entry(TransformType.GROUND, getTransformation(new Vector3f(0, 0.015F, 0.075F), Vector3f.ZERO, new Vector3f(0.25F, 0.25F, 0.25F))),
    entry(TransformType.FIXED, getTransformation(Vector3f.ZERO, Vector3f.ZERO, new Vector3f(0.5F, 0.5F, 0.5F))),
    entry(TransformType.FIRST_PERSON_LEFT_HAND, getTransformation(Vector3f.ZERO, new Vector3f(0, 315, 0), new Vector3f(0.4F, 0.4F, 0.4F))),
    entry(TransformType.FIRST_PERSON_RIGHT_HAND, getTransformation(Vector3f.ZERO, new Vector3f(0, 135, 0), new Vector3f(0.4F, 0.4F, 0.4F))),
    entry(TransformType.THIRD_PERSON_LEFT_HAND, getTransformation(new Vector3f(0F, 0.175F, 0), new Vector3f(75, 315, 0), new Vector3f(0.375F, 0.375F, 0.375F))),
    entry(TransformType.THIRD_PERSON_RIGHT_HAND, getTransformation(new Vector3f(0F, 0.175F, 0), new Vector3f(75, 135, 0), new Vector3f(0.375F, 0.375F, 0.375F)))
  );

  /**
   * Returns a new {@link Transformation} given the translation, rotation and scale {@link Vector3f vectors}.
   * 
   * @param translation - translation {@link Vector3f}.
   * @param rotation - rotation {@link Vector3f}, in degrees.
   * @param scale - scale {@link Vector3f}.
   * @return a new {@link Transformation}.
   */
  private static final Transformation getTransformation(Vector3f translation, Vector3f rotation, Vector3f scale) {
    return new Transformation(translation, TransformationHelper.quatFromXYZ(rotation, true), scale, null);
  }

  /**
   * Returns the correct Vertical Slab Item {@link Transformation} given the {@link TransformType}.
   * 
   * @param transformType - {@link TransformType}.
   * @return one of {@link #TRANSFORMATIONS Vertical Slab Item Transformations}.
   */
  public static final Transformation getTransformation(TransformType transformType) {
    return TRANSFORMATIONS.getOrDefault(transformType, Transformation.identity());
  }
}

All code is available here.

I am porting my mod from 1.18.2 to 1.19.2, in 1.18.2 the same code works fine, but in 1.19.2 it breaks.

Edited October 10, 20222 yr by X-Lomir
Improved clarity.

Not my area of expertise, but the error means you are pushing matrices onto the PoseStack and then not pop()ing them.

 

I can see your applyTransform() looks like you copied it from 1.18.2's IForgeBakedModel/ForgeHooksClient.handlePerspective()

But if you look at the 1.19.2 version of this code, IForgeBakedModel.applyTransform() that you override, it calls ItemTransform.apply() that applies the transform without a push().

12 minutes ago, warjort said:

Not my area of expertise, but the error means you are pushing matrices onto the PoseStack and then not pop()ing them.

 

I can see your applyTransform() looks like you copied it from 1.18.2's IForgeBakedModel/ForgeHooksClient.handlePerspective()

But if you look at the 1.19.2 version of this code, IForgeBakedModel.applyTransform() that you override, it calls ItemTransform.apply() that applies the transform without a push().

You're right, changing my code to

@Override
public BakedModel applyTransform(TransformType transformType, PoseStack poseStack, boolean applyLeftHandTransform) {
  ItemTransform transform = VerticalSlabPerspectiveTransformer.getTransformation(transformType);
  if (transform != ItemTransform.NO_TRANSFORM) {
    transform.apply(applyLeftHandTransform, poseStack);
  }
  return this;
}

and

public class VerticalSlabPerspectiveTransformer {
  /**
   * Map of all the Vertical Slab Item {@link Transformation transformations} associated with their respective {@link TransformType}.
   */
  private static final Map<TransformType, ItemTransform> TRANSFORMATIONS = Map.ofEntries(
    entry(TransformType.GUI, getItemTransform(new Vector3f(0.1F, -0.05F, 0), new Vector3f(30, 45, 0), new Vector3f(0.625F, 0.625F, 0.625F))),
    entry(TransformType.GROUND, getItemTransform(new Vector3f(0, 0.015F, 0.075F), Vector3f.ZERO, new Vector3f(0.25F, 0.25F, 0.25F))),
    entry(TransformType.FIXED, getItemTransform(Vector3f.ZERO, Vector3f.ZERO, new Vector3f(0.5F, 0.5F, 0.5F))),
    entry(TransformType.FIRST_PERSON_LEFT_HAND, getItemTransform(Vector3f.ZERO, new Vector3f(0, 315, 0), new Vector3f(0.4F, 0.4F, 0.4F))),
    entry(TransformType.FIRST_PERSON_RIGHT_HAND, getItemTransform(Vector3f.ZERO, new Vector3f(0, 135, 0), new Vector3f(0.4F, 0.4F, 0.4F))),
    entry(TransformType.THIRD_PERSON_LEFT_HAND, getItemTransform(new Vector3f(0F, 0.175F, 0), new Vector3f(75, 315, 0), new Vector3f(0.375F, 0.375F, 0.375F))),
    entry(TransformType.THIRD_PERSON_RIGHT_HAND, getItemTransform(new Vector3f(0F, 0.175F, 0), new Vector3f(75, 135, 0), new Vector3f(0.375F, 0.375F, 0.375F)))
  );

  /**
   * Returns the correct Vertical Slab Item {@link Transformation} given the {@link TransformType}.
   * 
   * @param transformType - {@link TransformType}.
   * @return one of {@link #TRANSFORMATIONS Vertical Slab Item Transformations}.
   */
  public static final ItemTransform getTransform(TransformType transformType) {
    return TRANSFORMATIONS.getOrDefault(transformType, ItemTransform.NO_TRANSFORM);
  }

  public static final ItemTransform getItemTransform(Vector3f translation, Vector3f rotation, Vector3f scale) {
    return new ItemTransform(rotation, translation, scale);
  }
}

works and doesn't make the game crash.

Some left hand transformation are a bit off, but I guess that's because of the new boolean variable and only needs some tinkering to fix.

Thanks