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| public:t-gede-16-1:lab7 [2016/03/01 20:15] – [Lab Project] marino | public:t-gede-16-1:lab7 [2024/04/29 13:33] (current) – external edit 127.0.0.1 |
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| ===== Discussion ===== | ===== Discussion ===== |
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| Discussion thread for this lab is here: [[https://piazza.com/class/i4l9of1fw8j3ew?cid=54|Lab 7 Discussion Thread]] | Discussion thread for this lab is here: [[https://piazza.com/class/ij2xbg3ztb41qt?cid=33|Lab 7 Discussion Thread]] |
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| ===== Goal ====== | ===== Goal ====== |
| profiles ps_1_1 arbfp1 | profiles ps_1_1 arbfp1 |
| } | } |
| </code>Notice that we are passing one parameter, ''mat_modelproj'', into the vertex shader. But instead of specifying a value, we simply indicate the name **worldviewproj_matrix**. This name refers to a [[http://stderr.org/doc/ogre-doc/manual/manual_20.html#SEC89|list of values]] that an ogre application can supply automatically to a shader program (that's why we use **param_named_auto**). We obviously won't know the model-to-view projection matrix when we create the material, so we want it supplied at run-time instead. Finally, create the material that uses these two new shader program definitions and additionally loads a texture into the available texture unit (copy the actual texture from ''\OgreSDK_vc10_v1-8-1\media\materials\textures\Water02.jpg'' into your **Materials** folder so that your material can find it for sure):<code> | </code>Notice that we are passing one parameter, ''mat_modelproj'', into the vertex shader. But instead of specifying a value, we simply indicate the name **worldviewproj_matrix**. This name refers to a [[http://www.ogre3d.org/docs/manual/manual_23.html#param_005findexed|list of values]] that an ogre application can supply automatically to a shader program (that's why we use **param_named_auto**). We obviously won't know the model-to-view projection matrix when we create the material, so we want it supplied at run-time instead. Finally, create the material that uses these two new shader program definitions and additionally loads a texture into the available texture unit (copy the actual texture from ''\OgreSDK_vc10_v1-8-1\media\materials\textures\Water02.jpg'' into your **Materials** folder so that your material can find it for sure):<code> |
| material shader/texture { | material shader/texture { |
| technique { | technique { |
| // We passed in the light and camera NodePaths and get their model space coordinates | // We passed in the light and camera NodePaths and get their model space coordinates |
| // here through the "mspos_<name>" variable. Everything here should be done in model space. | // here through the "mspos_<name>" variable. Everything here should be done in model space. |
| l_L = normalize(mspos_light.xyz - vtx_position.xyz); | // The w component of the mspos_light indicated whether the light is directional or a point. |
| | // So you must check whether you have to calculate the direction or use it directly. |
| | if( mspos_light.w == 1.0) { |
| | l_L = normalize(mspos_light.xyz - vtx_position.xyz); |
| | } else { |
| | l_L = mspos_light.xyz; |
| | } |
| l_V = normalize(mspos_camera.xyz - vtx_position.xyz); | l_V = normalize(mspos_camera.xyz - vtx_position.xyz); |
| l_P = vtx_position.xyz; | l_P = vtx_position.xyz; |
| |
| } | } |
| </code>As you can see, we are expecting the application to pass in the location of both the camera and the light into the vertex shader (in model space coordinates!). Luckily, these are available in the [[http://stderr.org/doc/ogre-doc/manual/manual_20.html#SEC89|list of automated values]] provided by Ogre. The shader program definition for the vertex shader is then: <code> | </code>As you can see, we are expecting the application to pass in the location of both the camera and the light into the vertex shader (in model space coordinates!). Luckily, these are available in the [[http://www.ogre3d.org/docs/manual/manual_23.html#param_005findexed|list of automated values]] provided by Ogre. The shader program definition for the vertex shader is then: <code> |
| vertex_program shader/lightingVP cg { | vertex_program shader/lightingVP cg { |
| source lightingshader.cg | source lightingshader.cg |
| } | } |
| </code>Now create a new material that uses these two shader program definitions and assign the material to the ogre model. You should see a properly shaded (albeit single colored) model! | </code>Now create a new material that uses these two shader program definitions and assign the material to the ogre model. You should see a properly shaded (albeit single colored) model! |
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| ===== Bonus ===== | ===== Bonus ===== |
| <box green 100%> | <box green 100%> |
| offset = (offset - 0.5f) * 2.0 ; | offset = (offset - 0.5f) * 2.0 ; |
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| | // You can change the last two values to configure the intensity and lightness of the shader. |
| float4 oColor = tex2D( RttTex, screenUV.xy + offset * 0.07 ) * 0.5 ; | float4 oColor = tex2D( RttTex, screenUV.xy + offset * 0.07 ) * 0.5 ; |
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| ===== When You Are Finished ===== | ===== When You Are Finished ===== |
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| Upload your **commented source files** into Lab7 in MySchool along with your Material and shader programs. (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 Lab7 in MySchool along with your **Material and shader programs**. (zip them up if more than one). The lab projects will not be graded, but their completion counts towards your participation grade. |
