Water Rendering
Water rendering is easy to achieve in Awakening.
Shader List:
Shader File |
Preview | Explanation |
| bump_nops.sha | use a bump map to distort reflected / refractive
image. Factor: vec4 water_normal -- the normalize normal vector of water surface vec4 water_param -- x : wave speed Usage: local waternormal=vec4.new(0,1,0) local wavespeed=0.2 material.setEffectVector('vecWaterNormal',waternormal) material.setEffectVector('vecWaterParam',vec4.new(wavespeed)) PixelShader: No |
Workflow:
1. Create a surface as water
2. Create a portal on the surface
3. Add two render targets
Right-Click in the Texture Browse Window, select "Add Render
Target" from the context menu. Then select a
image file in Open File Dialog. Please ensure the image width is same as height
(square image). Do same for
another render target.
4. Select render targets
Select the portal, in the Render To Texture rollout of portal panel, select
one render target; and check 'Consistent with back buffer'
style. Click the 'Actions'
button, add two actions:
| Message | Function | Object |
| Render Texture Begin | Hide | water surface |
| Render Texture End | Show | water surface |
In the Render To Texture (Mirror) rollout, select
another render target, and do same as above.
5. Add bump texture
Right-Click in the Texture Browse Window, select 'Add Bump Texture' from the context menu. Then select
"textures\wave_height.png" in Open File
Dialog.
6. Create material
In the Material panel, new a material; set 1st texture to the bump texture;
set 2nd texture to the render target in RTT(Mirror); set 3rd texture to the
render target in RTT; load shader file "effects\water\bump_nops.sha".
6. Assign the material to water surface
Please ensure no texture assign to water surface. You can use UV Tool to
adjust water surface's texture coordinates for changing wave size.
Tip: slightly offset portal along the normal of water surface to avoid seams near bank. (First select the portal, then select 'Edit > Move' from menu.)