Adding a Light - Revision history

Gmeader at 01:03, 10 November 2022

2022-11-10T01:03:53Z

Gmeader: /* Type of Light */

2022-10-03T17:23:41Z

Type of Light

Gmeader: add spotlight features, Gobo

2022-10-03T17:19:51Z

add spotlight features, Gobo

Gmeader: add lighting effects

2022-09-04T01:29:38Z

add lighting effects

Gmeader at 01:25, 4 September 2022

2022-09-04T01:25:48Z

Gmeader at 19:06, 28 March 2022

2022-03-28T19:06:21Z

Gmeader: /* Color of materials */

2021-04-25T18:44:15Z

Color of materials

Gmeader: /* Type of Light */

2021-04-07T21:06:38Z

Type of Light

Gmeader at 21:05, 7 April 2021

2021-04-07T21:05:50Z

Gmeader at 21:05, 7 April 2021

2021-04-07T21:05:05Z

@@ Line 7: / Line 7: @@
 [[File:NewLight.png]]
-A new spotlight is added
+A new spotlight is added.
 ==Type of Light==

@@ Line 18: / Line 18: @@
 '''SPOT''' - shines a cone of light in a specific direction.
-* SpotAngle - You can specify the angle of the diameter of the cone in degrees.
+* SpotAngle - You can specify the angle of the diameter of the cone in radians (should be degrees).
 * Its intensity fades out (falloff) over distance. Adjust the amount of falloff with the third Attenuation value  (set this by entering a value between 0 and 1)
 * Set the AmbientColor to 0,0,0 so that only the cone of light is illuminated.

@@ Line 7: / Line 7: @@
 [[File:NewLight.png]]
-A spotlight is added
+A new spotlight is added
 ==Type of Light==
@@ Line 17: / Line 17: @@
-'''SPOT''' - shines a cone of light in a specific direction. You can specify the radius of the cone. Its intensity fades out (falloff) over distance. Adjust the amount of falloff with the third Attenuation value  (set this by entering a value between 0 and 1)
+'''SPOT''' - shines a cone of light in a specific direction.
-Set the AmbientColor to 0,0,0 so that only the cone of light is illuminated.
+* SpotAngle - You can specify the angle of the diameter of the cone in degrees.
-DiffuseColor sets the color of the cone of light.
+* Its intensity fades out (falloff) over distance. Adjust the amount of falloff with the third Attenuation value  (set this by entering a value between 0 and 1)
 [[File:PointLight.png]]

@@ Line 54: / Line 54: @@
 Example materials settings: http://devernay.free.fr/cours/opengl/materials.html
 ==Lighting Effects==
@@ Line 73: / Line 63: @@
 * ProjectiveTextures aka “Gobos” - uses a gobo at distance d and rotation r from a light along the light direction.  Add the contribution of this texture to the surface.  Might want to add an angular term for 180o.  360o can just be two lights back to back
 * Mirror.water surface - render from POV of mirror and map to surface
 Next: '''[[Adding Sound]]'''

← Older revision		Revision as of 01:25, 4 September 2022
Line 54:		Line 54:

	Example materials settings: http://devernay.free.fr/cours/opengl/materials.html		Example materials settings: http://devernay.free.fr/cours/opengl/materials.html
		+
		+	=Lighting notes=
		+
		+	Divided into several categories; LightingEffects; TextureEffects, ProjectiveTextures and support for custom materials and shaders
		+
		+	==Texture Effects==
		+
		+	* Support for emissive textures.. This is a texture map that, when enabled, causes the display of the color in the map at the surface point; scaled by a float amplifier. Net effect: oversaturated glowing materials like lava.
		+	* Support for ambient occlusion map. This is a texture (B&W) that is computed by most modeling packages based on a more complex lighting calculation. All that this does is reduce the brightness of the pixel in question. Most modeling packages can now emit these. Note: not SSAO (screen space ambient occlusion) - this is slow. In this case, this is just another texture map, but it trims the illumination
		+	* Debug existing specular and displacement maps - these are not being picked up in importer, but can now be specified manually in the material.
		+
		+	==Lighting Effects==
		+	* Fog lights: https://ijdykeman.github.io/graphics/simple_fog_shader - this is a simple technique that colors fog based on proximity to a light.
		+	* Crepuscular rays. This is pretty cheap but requires a render to texture (hence previous ask for this) : https://fabiensanglard.net/lightScattering/
		+	* Glow light - this is a fog light, but without the “fog” part
		+
		+	==ProjectiveTextures==
		+	* ProjectiveTextures aka “Gobos” - uses a gobo at distance d and rotation r from a light along the light direction. Add the contribution of this texture to the surface. Might want to add an angular term for 180o. 360o can just be two lights back to back
		+	* Mirror.water surface - render from POV of mirror and map to surface
		+
		+	==Custom materials==
		+	* add support for any data values to materials
		+	* Materials become a map with arbitrary values that can be picked up by shaders
		+	* Template system for shaders (takes vars from shader and makes template)
		+	* Selection of surface shaders (water, etc)

	Next: '''[[Adding Sound]]'''		Next: '''[[Adding Sound]]'''

← Older revision		Revision as of 19:06, 28 March 2022
Line 54:		Line 54:

	Example materials settings: http://devernay.free.fr/cours/opengl/materials.html		Example materials settings: http://devernay.free.fr/cours/opengl/materials.html
		+
		+	Next: '''[[Adding Sound]]'''

@@ Line 45: / Line 45: @@
 In the real world, each object has a different reaction to light. Steel objects are often shinier than a clay vase for example and a wooden container doesn't react the same to light as a steel container. Some objects reflect the light without much scattering resulting in small specular highlights and others scatter a lot giving the highlight a larger radius.
-The ambient material defines what color the surface reflects under ambient lighting; this is usually the same as the surface's color. The diffuse material defines the color of the surface under diffuse lighting. The diffuse color is (just like ambient lighting) set to the desired surface's color. The specular sets the color of the specular highlight on the surface (or possibly even reflect a surface-specific color). Lastly, the shininess impacts the scattering/radius of the specular highlight.
+The ''ambient'' material defines what color the surface reflects under ambient lighting; this is usually the same as the surface's color.
 Example materials settings: http://devernay.free.fr/cours/opengl/materials.html

@@ Line 13: / Line 13: @@
 [[File:LightProperties.png]]
-In the Property Editor for the light, you can choose 4 different types of lights (the default is a spotlight)
+In the '''Property Editor''' for the light, you can choose 4 different types of lights (the default is a spotlight)
 and set the color and intensity (attenuation) and aimed direction (rotation) of a light
@@ Line 32: / Line 32: @@
 '''AMBIENT''' - illuminates from all directions, sort of like from the sky acts like a huge light. It does not fade out over distance.
-−
 ==Color of light==
 * '''Ambient lighting''': even when it is dark there is usually still some light somewhere in the world (the moon, a distant light) so objects are almost never completely dark. To simulate this we use an ambient lighting constant that always has the object reflecting some color.

← Older revision		Revision as of 21:05, 7 April 2021
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	[[File:NewLight.png]]		[[File:NewLight.png]]
		+
		+	A spotlight is added

	==Type of Light==		==Type of Light==