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| public:t-gede-13-1:lab6 [2013/03/05 12:51] – [Lab Project] hannes | public:t-gede-13-1:lab6 [2024/04/29 13:33] (current) – external edit 127.0.0.1 |
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| } | } |
| </code>Now create a new material that uses this vertex program definition instead of the regular texture vertex program definition and apply that material to the ground object in your application. You should see your ground move! | </code>Now create a new material that uses this vertex program definition instead of the regular texture vertex program definition and apply that material to the ground object in your application. You should see your ground move! |
| - **Per Pixel Phong Shader**Finally, let's try calculating the color value of a fragment based on an actual lighting model such as the Phong lighting model. Since we will be calculating the lighting value inside each fragment, we call this **per-pixel lighting**. This basically means that instead of using interpolated color values from the nearby vertices, we use interpolated vector values (model space vertex position, normal, view direction and light direction) to calculate the color value inside the fragment program. Create a new shader program file called ''lightingshader.cg'' and place the following code inside:<code> | - **Per Pixel Phong Shader**Finally, let's try calculating the color value of a fragment based on an actual lighting model such as the Phong lighting model. Since we will be calculating the lighting value inside each fragment, we call this **per-pixel lighting**. This basically means that instead of using interpolated color values from the nearby vertices, we use interpolated vector values (model space vertex position, normal, view direction and light direction) to calculate the color value inside the fragment program. Create a new shader program file called ''lightingshader.cg'' and place the following code inside:<code c> |
| // Cg | // Cg |
| void main_vp( | void main_vp( |
| } | } |
| </code>Notice that the light position that is provided is indexed as **light number 0**. This refers to the closest light source to the object (which in this case is the point light if you used the application code provided in the first step of this lab). We are also expecting the colors in our lighting model to be passed into the fragment shader, which could be provided by each material using this shader. This is the fragment shader program definition: <code> | </code>Notice that the light position that is provided is indexed as **light number 0**. This refers to the closest light source to the object (which in this case is the point light if you used the application code provided in the first step of this lab). We are also expecting the colors in our lighting model to be passed into the fragment shader, which could be provided by each material using this shader. This is the fragment shader program definition: <code> |
| | |
| fragment_program shader/lightingFP cg { | fragment_program shader/lightingFP cg { |
| source lightingshader.cg | source lightingshader.cg |
| entry_point fshader | entry_point main_fp |
| profiles ps_1_1 arbfp1 | profiles ps_2_0 arbfp1 |
| | |
| default_params { | default_params { |
| param_named k_ambientc float4 0.5 0.5 0.5 1.0 | param_named k_ambientc float4 0.5 0.5 0.5 1.0 |
