add multipart support and fix uvs

Author: YoanWithY

frontend/src/ts/math/mat2.ts

@@ -160,6 +160,26 @@ export default class mat2 {
 		return new mat2(cosa, -sina, sina, cosa);
 	}
 
+	public static rotationZ180() {
+		return mat2.fromColumnMajor(-1, 0, 0, -1);
+	}
+
+	public static rotationZ90CW() {
+		return mat2.fromColumnMajor(0, -1, 1, 0);
+	}
+
+	public static rotationZ270CW() {
+		return mat2.fromColumnMajor(0, 1, -1, 0);
+	}
+
+	public static rotationZ90CCW() {
+		return mat2.rotationZ270CW();
+	}
+	
+	public static rotationZ270CCW() {
+		return mat2.rotationZ90CW();
+	}
+
 	/**
 	 * Appends a rotation operation around the z-axis by a given angle.
 	 * @param a the angle to rotate in radians.

frontend/src/ts/minecraft/AbstractSection.ts

@@ -28,7 +28,7 @@ export class SingleBlockStateSection implements Section {
 		this.paletteEntry = paletteEntry;
 		const blockState = this.minecraftWorld.ressourcePack.getBlockStateByURL(this.paletteEntry.Name);
 		if (blockState) {
-			const blockStateModels = blockState.getVariantByProperties(paletteEntry.Properties);
+			const blockStateModels = blockState.getBlockStateModelByProperties(paletteEntry.Properties);
 			if (blockStateModels)
 				if (Array.isArray(blockStateModels))
 					this.blockStateModel = blockStateModels[0];