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| public:t-vien-08-1:lab_4_materials [2008/01/31 10:44] – hannes | public:t-vien-08-1:lab_4_materials [2024/04/29 13:33] (current) – external edit 127.0.0.1 |
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| from direct.interval.IntervalGlobal import * | from direct.interval.IntervalGlobal import * |
| </code> In your code, you should disable the mouse and then place the **camera** at **(1,-8,5)** with a pitch of **-25 degrees**. Then define a class called **World** that derives from **DirectObject** (this allows **World** to receive events). In the constructor of the **World** class load and display two models: **./Models/factoryfloor.egg** and **./Models/box.egg**. Position the box at **(1,0,2)**, scale it down to **30%** and give it a heading of **45 degrees**. Make sure you can see both the floor and the box. | </code> In your code, you should disable the mouse and then place the **camera** at **(1,-8,5)** with a pitch of **-25 degrees**. Then define a class called **World** that derives from **DirectObject** (this allows **World** to receive events). In the constructor of the **World** class load and display two models: **./Models/factoryfloor.egg** and **./Models/box.egg**. Position the box at **(1,0,2)**, scale it down to **30%** and give it a heading of **45 degrees**. Make sure you can see both the floor and the box. |
| - **Opening and closing the door:**\\ The floor model contains a **door** sub-object. Acquire a pathnode to it, using ''<pathnode>.find'', and call it **door**. Create two **[[http://www.panda3d.org/wiki/index.php/Lerp_Intervals|LerpPosInterval]]**s for the **door**, one to open it by moving it to location **(-1,0,0)** and one to close it by moving it to location **(1,0,0)**. You can play with the duration but **2.0 seconds** is a good place to start. Make the **World** accept a 'space' (spacebar key) event and call the associated event handler **self.door_handler**. In that handler, either start the opening interval for the door or the closing interval, depending on whether it's open or closed already (you'll need a new boolean member variable to keep track of that). Make sure you can now open and close the door with the spacebar.\\ | - **Opening and Closing the Door:**\\ The floor model contains a **door** sub-object. Acquire a pathnode to it, using ''<pathnode>.find'', and call it **door**. Create two **[[http://www.panda3d.org/wiki/index.php/Lerp_Intervals|LerpPosInterval]]**s for the **door**, one to open it by moving it to location **(-1,0,0)** and one to close it by moving it to location **(1,0,0)**. You can play with the duration but **2.0 seconds** is a good place to start. Make the **World** accept a 'space' (spacebar key) event and call the associated event handler **self.door_handler**. In that handler, either start the opening interval for the door or the closing interval, depending on whether it's open or closed already (you'll need a new boolean member variable to keep track of that). Make sure you can now open and close the door with the spacebar.\\ |
| - **Using blendType and name to Improve Door Movement:**\\ When you create the opening and closing intervals, give the constructor attribute **blendType** a value of **"easeInOut"** for a bit more realistic trap door motion (you can play with the other values **"easeIn"** and **"easeOut"** as well). Also, give the attribute **name** the same name for both intervals - this ensures that the first interval gets cancelled when the second one gets starts. | - **Using blendType and name to Improve Door Movement:**\\ When you create the opening and closing intervals, give the constructor attribute **blendType** a value of **"easeInOut"** for a bit more realistic trap door motion (you can play with the other values **"easeIn"** and **"easeOut"** as well). Also, give the attribute **name** the same name for both intervals - this ensures that the first interval gets cancelled when the second one gets starts. |
| - **Creating Collision Solids:**\\ Attach a new **CollisionNode** to the box pathnode and give it the name **"box"** (you pass the name into the constructor of the CollisionNode). To the node of this new pathnode, add a new collision solid of the type sphere and give it a radius of **1.5**.<code python> | - **Creating Collision Solids:**\\ Attach a new **CollisionNode** to the box pathnode and give it the name **"box"** (you pass the name into the constructor of the CollisionNode). To the node of this new pathnode, add a new collision solid of the type sphere and give it a radius of **1.5**.<code python> |
| </code> The very last thing to do is to call **''self.contactgroup.empty()''** right after you have called **''self.world.step(0.04)''** in order to start looking for fresh collisions after each iteration. Test to see if everything is working. \\ | </code> The very last thing to do is to call **''self.contactgroup.empty()''** right after you have called **''self.world.step(0.04)''** in order to start looking for fresh collisions after each iteration. Test to see if everything is working. \\ |
| - Play with various simulation values to see what effect they have on the object behavior. You could also try adding more boxes and have them pile on top of each other! | - Play with various simulation values to see what effect they have on the object behavior. You could also try adding more boxes and have them pile on top of each other! |
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| | {{:public:t-vien-07-1:lab4solution.zip|.}} |
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