{"id":14423,"date":"2025-08-04T21:15:38","date_gmt":"2025-08-04T19:15:38","guid":{"rendered":"https:\/\/pythonprogramming.altervista.org\/?p=14423"},"modified":"2025-08-08T19:03:50","modified_gmt":"2025-08-08T17:03:50","slug":"introduction-to-panda3d","status":"publish","type":"post","link":"https:\/\/pythonprogramming.altervista.org\/introduction-to-panda3d\/","title":{"rendered":"Introduction to Panda3d"},"content":{"rendered":"\n

Well, hello good people. Let’s get into Parnda3d, the module to create 3d games or 3d visuals with Python.<\/p>\n\n\n\n

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\"\"<\/a><\/figure>\n\n\n\n

Understanding Panda3D and the Panda Controller Script<\/h2>\n\n\n\n


What is Panda3D?
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Panda3D is a powerful, open-source 3D game engine used for creating games, simulations, and other 3D applications. It is written in C++ but is primarily used with Python, making it easy to learn and use for developers of all levels.<\/p>\n\n\n\n

How the pandas.py<\/code> Script Works<\/h2>\n\n\n\n


This script creates a simple 3D world with a controllable panda. Here is a breakdown of the key components:<\/p>\n\n\n\n

ShowBase<\/strong>: This is the main class for any Panda3D application. It sets up the main window, rendering pipeline, and other essential components.
Actor<\/strong>: The Actor class is used to load and control animated models. In this script, it loads the panda model and its walking animation.
Movement Control:<\/strong> The script uses the accept method to listen for keyboard events. When the arrow keys are pressed, the corresponding methods (move_forward, rotate_left, etc.) are called to update the panda’s position and orientation.
Camera Control:<\/strong> A task named camera_follow is added to the task manager. This task runs every frame and updates the camera’s position to follow the panda, creating a third-person view.
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How to Run the Script<\/h2>\n\n\n\n


To run the script, you will need to have Python and Panda3D installed. You can then execute the script from your terminal:<\/p>\n\n\n\n

python pandas.py<\/p>\n\n\n\n

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The Animation logic<\/h2>\n\n\n\n
    \n
  1. Animation Start\/Stop:<\/strong>\n
      \n
    • Now, when you press the “up arrow” key, the code checks if the “walk” animation is already playing.
      If not, it starts the walk animation loop.<\/li>\n\n\n\n
    • When you release the “up arrow” key, the else block is triggered, which immediately stops the current
      animation, making the panda stand still.<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n\n\n\n

      <\/p>\n\n\n\n

      from direct.showbase.ShowBase import ShowBase\nfrom direct.actor.Actor import Actor\nfrom panda3d.core import Vec3\n\nclass ActorControlExample(ShowBase):\n    def __init__(self):\n        super().__init__()\n        # Load the environment model.\n        self.scene = self.loader.loadModel(\"models\/environment\")\n        # Reparent the model to render.\n        self.scene.reparentTo(self.render)\n        # Apply scale and position transforms on the model.\n        self.scene.setScale(0.25, 0.25, 0.25)\n        self.scene.setPos(-8, 42, 0)\n\n        # Load the Actor with animations\n        self.panda = Actor(\n            \"models\/panda-model\",  # Model file\n            {\"walk\": \"models\/panda-walk4\"}  # Animasi file\n        )\n        self.panda.reparentTo(self.render)\n        self.panda.setScale(0.005)\n        self.panda.setPos(0, 0, 0)\n\n        # Initial Animation\n        # self.panda.loop(\"walk\")  # Start walking animation in a loop\n\n        # To store the state of the keys\n        self.keyMap = {\"forward\": False, \"left\": False, \"right\": False}\n\n        # Key bindings for movement controls\n        self.accept(\"arrow_up\", self.set_key, [\"forward\", True])\n        self.accept(\"arrow_up-up\", self.set_key, [\"forward\", False])\n        self.accept(\"arrow_left\", self.set_key, [\"left\", True])\n        self.accept(\"arrow_left-up\", self.set_key, [\"left\", False])\n        self.accept(\"arrow_right\", self.set_key, [\"right\", True])\n        self.accept(\"arrow_right-up\", self.set_key, [\"right\", False])\n\n        # Add a task to update the camera and panda movement\n        self.taskMgr.add(self.update, \"updateTask\")\n\n    def set_key(self, key, value):\n        \"\"\"Stores the state of the key.\"\"\"\n        self.keyMap[key] = value\n\n    def update(self, task):\n        \"\"\"Updates the panda's position and rotation based on key states.\"\"\"\n        dt = globalClock.getDt()\n\n        if self.keyMap[\"forward\"]:\n            self.panda.setY(self.panda, -1000 * dt)\n            if self.panda.getCurrentAnim() != \"walk\":\n                self.panda.loop(\"walk\")\n        else:\n            if self.panda.getCurrentAnim() == \"walk\":\n                self.panda.stop()\n\n        if self.keyMap[\"left\"]:\n            self.panda.setH(self.panda.getH() + 300 * dt)\n\n        if self.keyMap[\"right\"]:\n            self.panda.setH(self.panda.getH() - 300 * dt)\n\n        # Camera follows the panda\n        self.camera.setPos(self.panda.getPos() + Vec3(0, 20, 5))\n        self.camera.lookAt(self.panda)\n\n        return task.cont\n# Run the application\napp = ActorControlExample()\napp.run()<\/pre>\n\n\n\n
      <\/p>\n\n\n\n
      \r\n