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public:t-gede-14-1:lab8 [2014/03/10 20:03] – [Discussion] marinopublic:t-gede-14-1:lab8 [2024/04/29 13:33] (current) – external edit 127.0.0.1
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 ====== LAB8: Particle Systems ====== ====== LAB8: Particle Systems ======
  
-In this lab we will be checking out particle systems, This lab will be based on the "The Ogre 3D Startup Sequence" from the book "Ogre 3D 1.7 - Beginner's Guide" by Felix Kerger, Chapter 10. +In this lab we will be checking out particle systems, This lab will be roughly based on the "The Ogre 3D Startup Sequence" from the book "Ogre 3D 1.7 - Beginner's Guide" by Felix Kerger, Chapter 10.
  
  
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 ===== Preperation ===== ===== Preperation =====
 +You will have to create the folder ''ParticleSystems'' where your application can see it. and add the folder into your resource file like you have done in previous labs.
  
 +You can use your own project or start fresh with the base application {{:public:t-gede-14-1:lab6_handout.7z|code}}
 ===== Lab ===== ===== Lab =====
   - **Add the following code your MyApplication::createScene function** Here we are creating a particle system from the given examples that come with the ogre sdk, and attaching it to our Sinbad model. \\ You should see a "fireish" thingamajing emitting from the head of Sinbad. <code cpp>// Create a particle system   - **Add the following code your MyApplication::createScene function** Here we are creating a particle system from the given examples that come with the ogre sdk, and attaching it to our Sinbad model. \\ You should see a "fireish" thingamajing emitting from the head of Sinbad. <code cpp>// Create a particle system
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 colour_range_start 1 0 0 colour_range_start 1 0 0
 colour_range_end 0 0 1</code> colour_range_end 0 0 1</code>
-  - **Additional attributes,** Now remove all the addition lines added from the particle emitter leaving only the emission_rate, direction and velocity. And we will now modify the behaviour of the emitter, giving it a emission duration and restart delay. Lets make it emit particles for 1 second and then stop for one second before starting again. <code cpp>// Emit particles for 1 second at a time with a 1 second interval.+  - **Additional attributes,** Now remove all the additional lines added in the previous steps from the particle emitter leaving only the ''emission_rate, direction and velocity''. And we will now modify the behaviour of the emitter, giving it a emission duration and restart delay. Lets make it emit particles for 1 second and then stop for one second before starting again. <code cpp>// Emit particles for 1 second at a time with a 1 second interval.
 duration 1 duration 1
 repeat_delay 1</code> repeat_delay 1</code>
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  rate 10  rate 10
 }</code> }</code>
-    - **Colour fading affector** Colour affector will add the given values from the particle colour. To use it replace the scalar affector with: <code cpp>// This affector will add the following values to the colour of the particles each second.þ+    - **Colour fading affector** Colour affector will add the given values to the particle colour. To use it replace the scalar affector with: <code cpp>// This affector will add the following values to the colour of the particles each second.þ
 affector ColourFader { affector ColourFader {
  red 0.0  red 0.0
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  alpha2  -1  alpha2  -1
 }</code>  }</code> 
-    - And finally we have probably the most useful tool, called the ColorInterpelator. it works similarly to the ColorFader2 but with 1..6 number of states. It is used quite differently though. You provide the time on scale from 0-1 ''time# scale'' , and colours are given in the form ''colour# r g b a''.  Lets create a happy stream: <code cpp>// on ColourInterpolators you can have up to 6 colour intervals. +    - And finally we have the ColorInterpelator. It works similarly to the ColorFader2 but with 1..6 number of states. It is used quite differently though. You provide the time on scale from 0-1 ''time# scale'' , and colours are given in the form ''colour# r g b a''.  Lets create a jolly little stream: <code cpp>// ColourInterpolators can have up to 6 colour intervals indexed 0 to 5. 
 affector ColourInterpolator { affector ColourInterpolator {
  time0 0  time0 0
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  colour5 0 1 0 0  colour5 0 1 0 0
 }</code> **Note: **You have to define the default colour as ''colour 1 0 0 0'' in the point_emitter block to eliminate the stuttering when the particles spawn. Just remember to remove that for the next step. }</code> **Note: **You have to define the default colour as ''colour 1 0 0 0'' in the point_emitter block to eliminate the stuttering when the particles spawn. Just remember to remove that for the next step.
-  - **Direction Randomiser** We can make the particles change direction at random: <code cpp>// This will make the particles fly around like it has no tomorrow.+  - **Direction Randomiser** We can make the particles change direction at random: <code cpp>// This will make the particles fly around like they have no tomorrow.
 affector DirectionRandomiser { affector DirectionRandomiser {
  // This indicates the magnitude of the random choices the particle makes.  // This indicates the magnitude of the random choices the particle makes.
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  // Here you can indicate if the particle should randomize its velocity or not. <true|false>  // Here you can indicate if the particle should randomize its velocity or not. <true|false>
  keep_velocity true  keep_velocity true
-}</code> This could be useful for a pile of fireworks catching fire?, or a crowd of mosquitoes+}</code> This could be useful for a pile of fireworks catching fire?, or a swarm of mosquitoes.
   - **Deflector Planes** Deflector planes can make the particles change direction when they hit the deflector plane, the plane is provided in point normal form. <code cpp>// Deflector planes bounce the particles of the given plane.   - **Deflector Planes** Deflector planes can make the particles change direction when they hit the deflector plane, the plane is provided in point normal form. <code cpp>// Deflector planes bounce the particles of the given plane.
 affector DeflectorPlane { affector DeflectorPlane {
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 // Clasp Sinbads hands around the hilt of the sword. // Clasp Sinbads hands around the hilt of the sword.
 _SinbadEnt->getAnimationState("HandsClosed")->setEnabled(true);</code> _SinbadEnt->getAnimationState("HandsClosed")->setEnabled(true);</code>
-  - **Celebrate Sinbads amazing sword effect.** If you followed the last point then Sinbad is surely a happy seadog, and a happy fellow deserves a show! Create some fireworks using the particle system Ogre provides. //**Hint:** Check out the [[http://www.ogre3d.org/docs/manual/manual_38.html#Emitting-Emitters|Emitter emitters]]. I'll provide you with some skeleton code.// <code cpp>// Sse this as a base for your fireworks :)+  - **Celebrate Sinbads amazing sword effect.** If you followed the last point then Sinbad is surely a happy seadog, and a happy fellow deserves a show! Create some fireworks using the particle system Ogre provides. //**Hint:** Check out the [[http://www.ogre3d.org/docs/manual/manual_38.html#Emitting-Emitters|Emitter emitters]]. I'll provide you with some skeleton code.// <code cpp>// Use this as a base for your fireworks :)
 particle_system Fireworks { particle_system Fireworks {
  // Make the particles use the "Examples/Flare" material, and be 1x1 units large.  // Make the particles use the "Examples/Flare" material, and be 1x1 units large.
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 }</code> **Note: ** Affectors affect both the emitter and the emitter emitter :){{ :public:t-gede-14-1:ogre_fireworks.png?nolink |}} }</code> **Note: ** Affectors affect both the emitter and the emitter emitter :){{ :public:t-gede-14-1:ogre_fireworks.png?nolink |}}
-  - **Lastly** If you come up with a use for the particle system and think that it deserves an additional bonus point or half, then I might be generous :)  +  - **Lastly** If you come up with a use for the particle system and think that it deserves an additional bonus point or half, then I might be generous :)  \\ **Hint:** You could use the cylindrical effect from Lab 3 for interesting particle system effects :)
 </box> </box>
 ===== When You Are Finished ===== ===== When You Are Finished =====
  
 Upload your **commented source files** into Lab8 in MySchool (zip them up if more than one). The lab projects will not be graded, but their completion counts towards your participation grade. Upload your **commented source files** into Lab8 in MySchool (zip them up if more than one). The lab projects will not be graded, but their completion counts towards your participation grade.
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