Fade in/out

Fade in/out

• kulkarni

  Hi,
  I also want to do fade in/out, but I do not quite understand what you mean.
  I use Sprite to draw 2D textures and no Light is needed. I don't know how to use Light to change the appearance of those 2D texture.
  
  I can fade in/out the texture by setting the last parameter in Sprite.Draw(). But I don't know how to fade in/out the whole screen. Setting Light cannot change the appearance of the textures. Can you give me some examples on doing the fade in/out
  
  Thank you
  
  

• juanchoc

  
  In order to influence all your screen you need all your element in the screen
  to be influence by the Ambient light, and then you play with that ambient light value
  to fade in or out

  You create a light, and then Open it, and then you put the Ligthing state On
  You can also create a material

  The Light will affect all Vertex depending on the light in the scene
  and the material of your vertex

  For the Texture to be affected by the light you modulate it with Diffuse
  This way each vertex of your textured object will be affected by it's diffuse value

  I'm still not sure if you need to modulate with diffuse or not to get the fade
  But it give you other way to fade the texture object by modifying the
  diffuse component of your vertex

  You will need to do some test, with light, material, and ambient value
  Their is many combination possible to get your Fade

  I know I have a total Fade In and Fade out in my Program...(at home)
  All the screen go dark at once...and go back to full light
  When I modify the Ambient value (including textured object)

  It may because Lightning state is on and because ambient value work on all Object
  , or maybe it's because I modulate my texture with diffuse
  I'm still not sure which one make it work...maybe someone else can tell us :-)

  
  //Set ambient light level
  m_pD3DDevice->SetRenderState(D3DRS_AMBIENT, D3DCOLOR_XRGB(32, 32, 32));

  
  device->SetTextureStageState(0, D3DTSS_COLOROP,D3DTOP_MODULATE);
  device->SetTextureStageState(0, D3DTSS_COLORARG1,D3DTA_TEXTURE);
  device->SetTextureStageState(0, D3DTSS_COLORARG2,D3DTA_DIFFUSE);

  (your FVF must have a Diffuse part that you can modify with the fade you need)

  http://www.toymaker.info/Games/html/texture_states.html

  http://andypike.com/tutorials/DirectX8/007.asp

  D3DLIGHT8 d3dLight;

  //Initialize the light structure.
  ZeroMemory(&d3dLight, sizeof(D3DLIGHT8));

  //Set up a white point light at (0, 0, -10).
  d3dLight.Type = D3DLIGHT_POINT;

  d3dLight.Diffuse.r = 1.0f;
  d3dLight.Diffuse.g = 1.0f;
  d3dLight.Diffuse.b = 1.0f;

  d3dLight.Ambient.r = 0.0f;
  d3dLight.Ambient.g = 0.0f;
  d3dLight.Ambient.b = 0.0f;

  d3dLight.Specular.r = 0.0f;
  d3dLight.Specular.g = 0.0f;
  d3dLight.Specular.b = 0.0f;

  d3dLight.Position.x = 0.0f;
  d3dLight.Position.y = 0.0f;
  d3dLight.Position.z = -10.0f;

  d3dLight.Attenuation0 = 1.0f;
  d3dLight.Attenuation1 = 0.0f;
  d3dLight.Attenuation2 = 0.0f;
  d3dLight.Range = 100.0f;

  //Assign the point light to our device in poisition (index) 0
  m_pD3DDevice->SetLight(0, &d3dLight);

  //Enable our point light in position (index) 0
  m_pD3DDevice->LightEnable(0, TRUE);

  //Turn on lighting
  m_pD3DDevice->SetRenderState(D3DRS_LIGHTING, TRUE);

  //Set ambient light level
  m_pD3DDevice->SetRenderState(D3DRS_AMBIENT, D3DCOLOR_XRGB(32, 32, 32));

  
  

• Wenlong.Dong

  Set Ambient Light State to a decreasing or increasing value

  would be good if it's all the screen you want to fade out...

  Set the Texture Arg1 to Texture
  and Diffuse for Arg2
  Operation to Modulate...

  this way your texture will fade out with the light

  
  
• Fade in/out