c++的3D游戏笔录-panda3d(4)

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2024-04-05 帮助1人

1、要创建自己的Actor类，至少完成以下工作：
加载Actor模型
加载动画
使用AnimControl或AnimControlCollection建造模型和动画
2、加载panda模型和行走动画，window->loop_animations(0)。构造所有加载后的模型和它们的动画，在节点路径render之下。
3、一些加载的动画在调用之后，直到下一个同样的方法再次调用将不会显示。
4、任何不属于render的节点路径下的加载的动画，例如render_2d，都不会显示，即使调用了window->loop_animations(0)。要显示这样的动画，必须应用一些其它步骤。
5、首先加载模型文件

 NodePath scene = window->load_model(framework.get_models(), "models/environment");

    scene.reparent_to(window->get_render());

    scene.set_scale(0.25, 0.25, 0.25);

    scene.set_pos(-8, 42, 0);


    // Load our panda

    NodePath pandaActor = window->load_model(framework.get_models(), "models/panda-model");

    pandaActor.set_scale(0.005);

    pandaActor.reparent_to(window->get_render());

和动画文件





    // Load the walk animation

    window->load_model(pandaActor, "models/panda-walk4");

比如常见模型，然后，我们简单调用loop_animations(0)，循环所有动画。

    window->loop_animations(0); // bind models and animations

                                //set animations to loop

#include "pandaFramework.h"

#include "pandaSystem.h"


#include "genericAsyncTask.h"

#include "asyncTaskManager.h"


// Global stuff

PT(AsyncTaskManager) taskMgr = AsyncTaskManager::get_global_ptr();

PT(ClockObject) globalClock = ClockObject::get_global_clock();

NodePath camera;


// Task to move the camera

AsyncTask::DoneStatus SpinCameraTask(GenericAsyncTask* task, void* data) {

    double time = globalClock->get_real_time();

    double angledegrees = time * 6.0;

    double angleradians = angledegrees * (3.14 / 180.0);

    camera.set_pos(20 * sin(angleradians), -20.0 * cos(angleradians), 3);

    camera.set_hpr(angledegrees, 0, 0);


    return AsyncTask::DS_cont;

}


int main(int argc, char* argv[]) {

    // Open a new window framework and set the title

    PandaFramework framework;

    framework.open_framework(argc, argv);

    framework.set_window_title("My Panda3D Window");


    // Open the window

    WindowFramework* window = framework.open_window();

    camera = window->get_camera_group(); // Get the camera and store it


    // Load the environment model

    NodePath scene = window->load_model(framework.get_models(), "models/environment");

    scene.reparent_to(window->get_render());

    scene.set_scale(0.25, 0.25, 0.25);

    scene.set_pos(-8, 42, 0);


    // Load our panda

    NodePath pandaActor = window->load_model(framework.get_models(), "models/panda-model");

    pandaActor.set_scale(0.005);

    pandaActor.reparent_to(window->get_render());


    // Load the walk animation

    window->load_model(pandaActor, "models/panda-walk4");

    window->loop_animations(0); // bind models and animations

                                //set animations to loop


    // Add our task do the main loop, then rest in peace.

    taskMgr->add(new GenericAsyncTask("Spins the camera", &SpinCameraTask, nullptr));

    framework.main_loop();

    framework.close_framework();

    return 0;

}

学新通
6、间隔
间隔是在指定的时间段内将属性从一个值更改为另一个值的任务。启动间隔可以有效地启动一个后台进程，该进程在指定的时间段内修改属性。

 // Create the lerp intervals needed to walk back and forth

    PT(CLerpNodePathInterval) pandaPosInterval1, pandaPosInterval2,

        pandaHprInterval1, pandaHprInterval2;

    pandaPosInterval1 = new CLerpNodePathInterval("pandaPosInterval1",

        13.0, CLerpInterval::BT_no_blend,

        true, false, pandaActor, NodePath());

    pandaPosInterval1->set_start_pos(LPoint3(0, 10, 0));

    pandaPosInterval1->set_end_pos(LPoint3(0, -10, 0));


    pandaPosInterval2 = new CLerpNodePathInterval("pandaPosInterval2",

        13.0, CLerpInterval::BT_no_blend,

        true, false, pandaActor, NodePath());

    pandaPosInterval2->set_start_pos(LPoint3(0, -10, 0));

    pandaPosInterval2->set_end_pos(LPoint3(0, 10, 0));


    pandaHprInterval1 = new CLerpNodePathInterval("pandaHprInterval1", 3.0,

        CLerpInterval::BT_no_blend,

        true, false, pandaActor, NodePath());

    pandaHprInterval1->set_start_hpr(LPoint3(0, 0, 0));

    pandaHprInterval1->set_end_hpr(LPoint3(180, 0, 0));


    pandaHprInterval2 = new CLerpNodePathInterval("pandaHprInterval2", 3.0,

        CLerpInterval::BT_no_blend,

        true, false, pandaActor, NodePath());

    pandaHprInterval2->set_start_hpr(LPoint3(180, 0, 0));

    pandaHprInterval2->set_end_hpr(LPoint3(0, 0, 0));

（1）pandaPosInterval1间隔调整熊猫的位置从 (0, 10, 0) 到 (0, -10, 0)，每13秒调整一次。
（2）同样，当pandaHprInterval1间隔启动后，panda的方向将旋转180度每3秒。

7、序列
序列有时称为MetaIntervals，是一种包含其他间隔的间隔类型。播放一个序列将导致每个包含的间隔按顺序执行，一个接一个。

 // Create and play the sequence that coordinates the intervals

    PT(CMetaInterval) pandaPace;

    pandaPace = new CMetaInterval("pandaPace");

    pandaPace->add_c_interval(pandaPosInterval1, 0,

        CMetaInterval::RS_previous_end);

    pandaPace->add_c_interval(pandaHprInterval1, 0,

        CMetaInterval::RS_previous_end);

    pandaPace->add_c_interval(pandaPosInterval2, 0,

        CMetaInterval::RS_previous_end);

    pandaPace->add_c_interval(pandaHprInterval2, 0,

        CMetaInterval::RS_previous_end);

    pandaPace->loop();

整个序列完成：
熊猫在直线上移动，转弯，在相反的直线上移动，最后再次转弯。
代码pandpace .loop()使Sequence以循环模式启动。

全部程序如下：

#include "pandaFramework.h"

#include "pandaSystem.h"


#include "genericAsyncTask.h"

#include "asyncTaskManager.h"


#include "cIntervalManager.h"

#include "cLerpNodePathInterval.h"

#include "cMetaInterval.h"


// Global stuff

PT(AsyncTaskManager) taskMgr = AsyncTaskManager::get_global_ptr();

PT(ClockObject) globalClock = ClockObject::get_global_clock();

NodePath camera;


// Task to move the camera

AsyncTask::DoneStatus SpinCameraTask(GenericAsyncTask* task, void* data) {

    double time = globalClock->get_real_time();

    double angledegrees = time * 6.0;

    double angleradians = angledegrees * (3.14 / 180.0);

    camera.set_pos(20 * sin(angleradians), -20.0 * cos(angleradians), 3);

    camera.set_hpr(angledegrees, 0, 0);


    return AsyncTask::DS_cont;

}


int main(int argc, char* argv[]) {

    // Open a new window framework and set the title

    PandaFramework framework;

    framework.open_framework(argc, argv);

    framework.set_window_title("game2");


    // Open the window

    WindowFramework* window = framework.open_window();

    camera = window->get_camera_group(); // Get the camera and store it


    // Load the environment model

    NodePath scene = window->load_model(framework.get_models(),

        "models/environment");

    scene.reparent_to(window->get_render());

    scene.set_scale(0.25, 0.25, 0.25);

    scene.set_pos(-8, 42, 0);


    // Load our panda

    NodePath pandaActor = window->load_model(framework.get_models(),

        "models/panda-model");

    pandaActor.set_scale(0.005);

    pandaActor.reparent_to(window->get_render());


    // Load the walk animation

    window->load_model(pandaActor, "models/panda-walk4");

    window->loop_animations(0);


    // Create the lerp intervals needed to walk back and forth

    PT(CLerpNodePathInterval) pandaPosInterval1, pandaPosInterval2,

        pandaHprInterval1, pandaHprInterval2;

    pandaPosInterval1 = new CLerpNodePathInterval("pandaPosInterval1",

        13.0, CLerpInterval::BT_no_blend,

        true, false, pandaActor, NodePath());

    pandaPosInterval1->set_start_pos(LPoint3(0, 10, 0));

    pandaPosInterval1->set_end_pos(LPoint3(0, -10, 0));


    pandaPosInterval2 = new CLerpNodePathInterval("pandaPosInterval2",

        13.0, CLerpInterval::BT_no_blend,

        true, false, pandaActor, NodePath());

    pandaPosInterval2->set_start_pos(LPoint3(0, -10, 0));

    pandaPosInterval2->set_end_pos(LPoint3(0, 10, 0));


    pandaHprInterval1 = new CLerpNodePathInterval("pandaHprInterval1", 3.0,

        CLerpInterval::BT_no_blend,

        true, false, pandaActor, NodePath());

    pandaHprInterval1->set_start_hpr(LPoint3(0, 0, 0));

    pandaHprInterval1->set_end_hpr(LPoint3(180, 0, 0));


    pandaHprInterval2 = new CLerpNodePathInterval("pandaHprInterval2", 3.0,

        CLerpInterval::BT_no_blend,

        true, false, pandaActor, NodePath());

    pandaHprInterval2->set_start_hpr(LPoint3(180, 0, 0));

    pandaHprInterval2->set_end_hpr(LPoint3(0, 0, 0));


    // Create and play the sequence that coordinates the intervals

    PT(CMetaInterval) pandaPace;

    pandaPace = new CMetaInterval("pandaPace");

    pandaPace->add_c_interval(pandaPosInterval1, 0,

        CMetaInterval::RS_previous_end);

    pandaPace->add_c_interval(pandaHprInterval1, 0,

        CMetaInterval::RS_previous_end);

    pandaPace->add_c_interval(pandaPosInterval2, 0,

        CMetaInterval::RS_previous_end);

    pandaPace->add_c_interval(pandaHprInterval2, 0,

        CMetaInterval::RS_previous_end);

    pandaPace->loop();


    // Add our task.

    taskMgr->add(new GenericAsyncTask("Spins the camera",

        &SpinCameraTask, nullptr));


    // This is a simpler way to do stuff every frame,

    // if you're too lazy to create a task.

    Thread* current_thread = Thread::get_current_thread();

    while (framework.do_frame(current_thread)) {

        // Step the interval manager

        CIntervalManager::get_global_ptr()->step();

    }


    framework.close_framework();

    return 0;

}

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