GeoMipTerrain and CollisionRay issue

C++ coding using Panda3D
1

Hi!!
I try to handle the collision between GeoMipTerrain and CollisionRay with this code:

#include "pandaFramework.h"
#include "pandaSystem.h"
#include <collisionNode.h>
#include <collisionRay.h>
#include <collisionTraverser.h>
#include <collisionHandlerQueue.h>
#include "load_prc_file.h"
#include <geoMipTerrain.h>  
 
 
PandaFramework framework;
CollisionTraverser trav;
CollisionHandlerQueue* queue;
CollisionRay* ray;


void clickOnObject(const Event* ev, void* data) {
    WindowFramework* win = framework.get_window(0);
    float x = (2 * win->get_graphics_window()->get_pointer(0).get_x()) / ((float)win->get_graphics_window()->get_x_size())- 1;
    float y = (2 * win->get_graphics_window()->get_pointer(0).get_y()) / ((float)win->get_graphics_window()->get_y_size())- 1;
    ray->set_from_lens(framework.get_window(0)->get_camera(0), x, y);
    trav.traverse(framework.get_window(0)->get_render());
    cout << queue->get_num_entries() << endl;
}

int main(int argc, char *argv[]) {
    framework.open_framework(argc, argv);
    framework.set_window_title("My Panda3D Window");
    WindowFramework *window = framework.open_window();
    framework.get_window(0)->enable_keyboard();

    load_prc_file_data("", "notify-level-collide debug");

    // terrain
    GeoMipTerrain *terrain;
    terrain =  new GeoMipTerrain("mySimpleTerrain");
    terrain->set_heightfield(Filename("map.png"));
    terrain->get_root().reparent_to(window->get_render()); 
    terrain->generate();
    terrain->get_root().set_collide_mask(BitMask32::bit(22));
    // look at the terrain
    window->get_camera_group().set_pos(0, 0, 20);
    window->get_camera_group().look_at(terrain->get_root());
    // collision system
    queue = new CollisionHandlerQueue();
    CollisionNode* cnode= new CollisionNode("ray");
    ray = new CollisionRay();
    cnode->add_solid(ray);
    cnode->set_from_collide_mask(BitMask32::bit(22));
    NodePath cpath(cnode);
    cpath.reparent_to(window->get_camera_group());
    trav.add_collider(cpath, queue);
    
    framework.define_key("mouse1", "click", clickOnObject, NULL);
 
    framework.main_loop();
    framework.close_framework();
    return (0);
}

but when i click on the terrain, it’s printed 0 in the terminal! (0 is the number of collisions)

where am i wrong??

2

i have found where am i wrong…

float y = (2 * win->get_graphics_window()->get_pointer(0).get_y()) / ((float)win->get_graphics_window()->get_y_size())- 1;
y*=-1;

And in the next time, I remember call generate method before assign collide mask to the terrain’s root!!!

:smiley: