LuxCoreRender Materials Glass - Revision history

CodeHD: Added dispersion; reference to new dispersion page; included thin film description

2020-10-23T22:11:48Z

Added dispersion; reference to new dispersion page; included thin film description

← Older revision		Revision as of 00:11, 24 October 2020
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	=== IOR ===		=== IOR ===

	The index of refraction for the material. This value determines the overall appearance of the material, and should be set according to the material you are trying to simulate.		The index of refraction for the material. This value determines the overall appearance of the material, and should be set according to the material you are trying to simulate. In combination with dispersion (see below), it should be set with the Cauchy-A coefficient.


			=== Dispersion ===

			Dispersion means that the IOR is calculated as a function of the wavelength, i.e. the color, of light. Setting a value greater than 0 puts the glass material in a spectral mode. This will make rendering slower, but increases the realism by adding color effects.

			LuxCore uses a two-term Cauchy-equation to model dispersion. Dispersion is measured by the Cauchy-B coefficient. Realistic values range from roughly 0.003 to 0.0015. For further information, see [[Glass_Material_IOR_and_Dispersion\|Glass Material IOR and Dispersion]].


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	This is the color that the light will be filtered to after being transmitted. The color given here will be applied to the material uniformly, you may wish to derive the color from the objects volume instead.		This is the color that the light will be filtered to after being transmitted. The color given here will be applied to the material uniformly, you may wish to derive the color from the objects volume instead.

	~~<!-- Cauchy B Not yet available in LuxCore.~~

	This is the ~~B value to Cauchy's equation~~. (The ~~value specified under~~ IOR ~~will be used for n) Setting this to anything other than 0 will enable chromatic dispersion~~, ~~aka splitting the spectrum into~~ a ~~rainbow~~ of ~~colors~~. ~~Be warned this is an intensive~~ effect ~~that~~ will ~~greatly increase~~ the ~~number of samples (and photons, if applicable) that are needed! -->~~		=== Thin Film ===

			This allows you to define a film coating on top of the glass. This usually results in a rainbow colored reflection. It has two controls, a thickness and IOR. The IOR should match that of your film material (Cleaning solution, which can leave such a film behind, has an IOR of ~1.3-1.35, due to being almost entirely water). You can vary the thickness to achieve the desired effect. A thickness of several hundred nm will result in the most pronounced effect.


	=== Architectural ===		=== Architectural ===
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	This option disables refraction during transmission. The effective result is that transmission will appear as though the glass had an IOR of 1.0, while reflections will use the specified IOR. The resulting glass will show only the transmission/reflection colors and volumes effects. You could enable this option for a thin sheet of glass such as a window. The render output difference will be minimal, and it will render much faster, as there is less to compute. However, disable it on any curved glass as it will make the object look fake.		This option disables refraction during transmission. The effective result is that transmission will appear as though the glass had an IOR of 1.0, while reflections will use the specified IOR. The resulting glass will show only the transmission/reflection colors and volumes effects. You could enable this option for a thin sheet of glass such as a window. The render output difference will be minimal, and it will render much faster, as there is less to compute. However, disable it on any curved glass as it will make the object look fake.

	There are several other important features to architectural mode, besides reducing the necessary calculations of the material. Because there is no refraction during transmission, architectural glass is transparent to shadow rays and alpha, neither of which is the case in non-architectural mode. This is especially important for window glass. Because it is transparent to shadow rays, it is possible to perform direct light sampling through the window to outside light sources, greatly improving the render efficiency. And because it reflects but still propagates alpha, it allows you to have realistic interior reflections and absorption on the windows, while still being able to composite in a backdrop for the view outside of the window.		There are several other important features to architectural mode, besides reducing the necessary calculations of the material. Because there is no refraction during transmission, architectural glass is transparent to shadow rays and alpha, neither of which is the case in non-architectural mode. This is especially important for window glass. Because it is transparent to shadow rays, it is possible to perform direct light sampling through the window to outside light sources, greatly improving the render efficiency. And because it reflects but still propagates alpha, it allows you to have realistic interior reflections and absorption on the windows, while still being able to composite in a backdrop for the view outside of the window.



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	<!-- Cauchy B Not yet available in LuxCore.		<!-- Cauchy B Not yet available in LuxCore.
	~~=== Thin Film ===~~

	This ~~allows you~~ to ~~define a film coating on top of~~ the ~~glass. This usually results in~~ a rainbow ~~colored reflection~~. ~~It has two controls, a depth and IOR. The IOR should match~~ that of ~~your film material~~ (~~Cleaning solution, which can leave such a film behind~~, ~~has an IOR of ~1.3-1.35, due to being almost entirely water~~)~~. Refer to the image below to gain the desired effect.~~		This is the B value to Cauchy's equation. (The value specified under IOR will be used for n) Setting this to anything other than 0 will enable chromatic dispersion, aka splitting the spectrum into a rainbow of colors. Be warned this is an intensive effect that will greatly increase the number of samples (and photons, if applicable) that are needed! -->
	-->

	<!--		<!--

Piita at 21:08, 18 December 2017

2017-12-18T21:08:41Z

← Older revision		Revision as of 23:08, 18 December 2017
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	=== Architectural ===		=== Architectural ===

			[[file:Glass_architectural.jpg\|300px\|thumb\|left\|For thin sheets of glass the lack of refraction in architectural glass does not matter]]
	This option disables refraction during transmission. The effective result is that transmission will appear as though the glass had an IOR of 1.0, while reflections will use the specified IOR. The resulting glass will show only the transmission/reflection colors and volumes effects. You could enable this option for a thin sheet of glass such as a window. The render output difference will be minimal, and it will render much faster, as there is less to compute. However, disable it on any curved glass as it will make the object look fake.		This option disables refraction during transmission. The effective result is that transmission will appear as though the glass had an IOR of 1.0, while reflections will use the specified IOR. The resulting glass will show only the transmission/reflection colors and volumes effects. You could enable this option for a thin sheet of glass such as a window. The render output difference will be minimal, and it will render much faster, as there is less to compute. However, disable it on any curved glass as it will make the object look fake.

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	[[~~file:Glass_architectural.jpg~~\|~~300px\|thumb\|left\|For thin sheets of glass the lack of refraction in architectural glass does not matter~~]]
			<br clear="all"/>



			Back to [[LuxCoreRender_Materials\|Materials]]

	<!-- Cauchy B Not yet available in LuxCore.		<!-- Cauchy B Not yet available in LuxCore.
	=== Thin Film ===		=== Thin Film ===

Byob: /* Architectural */ added a description to the archglass image

2017-12-18T16:14:56Z

Architectural: added a description to the archglass image

← Older revision		Revision as of 18:14, 18 December 2017
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	[[file:Glass_architectural.jpg\|300px]]		[[file:Glass_architectural.jpg\|300px\|thumb\|left\|For thin sheets of glass the lack of refraction in architectural glass does not matter]]
	<!-- Cauchy B Not yet available in LuxCore.		<!-- Cauchy B Not yet available in LuxCore.
	=== Thin Film ===		=== Thin Film ===

Piita at 08:14, 9 December 2017

2017-12-09T08:14:52Z

← Older revision		Revision as of 10:14, 9 December 2017
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	=== Transmission Color ===		=== Transmission Color ===

	This is the color that the light will be filtered to after being transmitted. The color given here will be applied to the material uniformly, you may wish to derive the color from the objects volume instead~~. (or use the glass2 material, which uses the volume for nearly everything)~~.		This is the color that the light will be filtered to after being transmitted. The color given here will be applied to the material uniformly, you may wish to derive the color from the objects volume instead.

	<!-- Cauchy B Not yet available in LuxCore.		<!-- Cauchy B Not yet available in LuxCore.
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	=== Architectural ===		=== Architectural ===

	This option disables refraction during transmission. The effective result is that transmission will appear as though the glass had an IOR of 1.0, while reflections will use the specified IOR. The resulting glass will show only the transmission/reflection colors and volumes effects. You could enable this option for a thin sheet of glass such as a window, and it will render much faster, as there is less to compute. However, disable it on any curved glass as it will make the object look fake.		This option disables refraction during transmission. The effective result is that transmission will appear as though the glass had an IOR of 1.0, while reflections will use the specified IOR. The resulting glass will show only the transmission/reflection colors and volumes effects. You could enable this option for a thin sheet of glass such as a window. The render output difference will be minimal, and it will render much faster, as there is less to compute. However, disable it on any curved glass as it will make the object look fake.

	There are several other important features to architectural mode, besides reducing the necessary calculations of the material. Because there is no refraction during transmission, architectural glass is transparent to shadow rays and alpha, neither of which is the case in non-architectural mode. This is especially important for window glass. Because it is transparent to shadow rays, it is possible to perform direct light sampling through the window to outside light sources, greatly improving the render efficiency. And because it reflects but still propagates alpha, it allows you to have realistic interior reflections and absorption on the windows, while still being able to composite in a backdrop for the view outside of the window.		There are several other important features to architectural mode, besides reducing the necessary calculations of the material. Because there is no refraction during transmission, architectural glass is transparent to shadow rays and alpha, neither of which is the case in non-architectural mode. This is especially important for window glass. Because it is transparent to shadow rays, it is possible to perform direct light sampling through the window to outside light sources, greatly improving the render efficiency. And because it reflects but still propagates alpha, it allows you to have realistic interior reflections and absorption on the windows, while still being able to composite in a backdrop for the view outside of the window.


			[[file:Glass_architectural.jpg\|300px]]
	<!-- Cauchy B Not yet available in LuxCore.		<!-- Cauchy B Not yet available in LuxCore.
	=== Thin Film ===		=== Thin Film ===
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	-->		-->

			<!--
	=== Glass and Glass2 ===		=== Glass and Glass2 ===

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	On the other hand, Glass has got the option for a separate reflection and transmission color (for painted glass) or using a thin film coating.		On the other hand, Glass has got the option for a separate reflection and transmission color (for painted glass) or using a thin film coating.
			-->

	<!--		<!--

Piita at 21:03, 7 December 2017

2017-12-07T21:03:28Z

← Older revision		Revision as of 23:03, 7 December 2017
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			[[file:Luxcore_materials_glass.jpg\|400px]]

	The glass material represents a smooth dielectric substance. It works well for materials such glass, crystals, clear liquid, transparent plastic, and gemstones.		The glass material represents a smooth dielectric substance. It works well for materials such glass, crystals, clear liquid, transparent plastic, and gemstones.

Piita at 21:24, 5 December 2017

2017-12-05T21:24:54Z

← Older revision		Revision as of 23:24, 5 December 2017
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	There are several other important features to architectural mode, besides reducing the necessary calculations of the material. Because there is no refraction during transmission, architectural glass is transparent to shadow rays and alpha, neither of which is the case in non-architectural mode. This is especially important for window glass. Because it is transparent to shadow rays, it is possible to perform direct light sampling through the window to outside light sources, greatly improving the render efficiency. And because it reflects but still propagates alpha, it allows you to have realistic interior reflections and absorption on the windows, while still being able to composite in a backdrop for the view outside of the window.		There are several other important features to architectural mode, besides reducing the necessary calculations of the material. Because there is no refraction during transmission, architectural glass is transparent to shadow rays and alpha, neither of which is the case in non-architectural mode. This is especially important for window glass. Because it is transparent to shadow rays, it is possible to perform direct light sampling through the window to outside light sources, greatly improving the render efficiency. And because it reflects but still propagates alpha, it allows you to have realistic interior reflections and absorption on the windows, while still being able to composite in a backdrop for the view outside of the window.

			<!-- Cauchy B Not yet available in LuxCore.
	=== Thin Film ===		=== Thin Film ===

	This allows you to define a film coating on top of the glass. This usually results in a rainbow colored reflection. It has two controls, a depth and IOR. The IOR should match that of your film material (Cleaning solution, which can leave such a film behind, has an IOR of ~1.3-1.35, due to being almost entirely water). Refer to the image below to gain the desired effect.		This allows you to define a film coating on top of the glass. This usually results in a rainbow colored reflection. It has two controls, a depth and IOR. The IOR should match that of your film material (Cleaning solution, which can leave such a film behind, has an IOR of ~1.3-1.35, due to being almost entirely water). Refer to the image below to gain the desired effect.
			-->

Piita: Created page with " The glass material represents a smooth dielectric substance. It works well for materials such glass, crystals, clear liquid, transparent plastic, and gemstones. == Options..."

2017-12-05T18:12:45Z

Created page with " The glass material represents a smooth dielectric substance. It works well for materials such glass, crystals, clear liquid, transparent plastic, and gemstones. == Options..."

New page

The glass material represents a smooth dielectric substance. It works well for materials such glass, crystals, clear liquid, transparent plastic, and gemstones.

== Options ==

=== IOR ===

The index of refraction for the material. This value determines the overall appearance of the material, and should be set according to the material you are trying to simulate.

=== Reflection Color ===

This is the color of light reflected from the surface.

=== Transmission Color ===

This is the color that the light will be filtered to after being transmitted. The color given here will be applied to the material uniformly, you may wish to derive the color from the objects volume instead. (or use the glass2 material, which uses the volume for nearly everything).



=== Architectural ===

This option disables refraction during transmission. The effective result is that transmission will appear as though the glass had an IOR of 1.0, while reflections will use the specified IOR. The resulting glass will show only the transmission/reflection colors and volumes effects. You could enable this option for a thin sheet of glass such as a window, and it will render much faster, as there is less to compute. However, disable it on any curved glass as it will make the object look fake.

There are several other important features to architectural mode, besides reducing the necessary calculations of the material. Because there is no refraction during transmission, architectural glass is transparent to shadow rays and alpha, neither of which is the case in non-architectural mode. This is especially important for window glass. Because it is transparent to shadow rays, it is possible to perform direct light sampling through the window to outside light sources, greatly improving the render efficiency. And because it reflects but still propagates alpha, it allows you to have realistic interior reflections and absorption on the windows, while still being able to composite in a backdrop for the view outside of the window.

=== Thin Film ===

This allows you to define a film coating on top of the glass. This usually results in a rainbow colored reflection. It has two controls, a depth and IOR. The IOR should match that of your film material (Cleaning solution, which can leave such a film behind, has an IOR of ~1.3-1.35, due to being almost entirely water). Refer to the image below to gain the desired effect.

=== Glass and Glass2 ===

LuxCoreRender also contains a "Glass2" material which is similar in appearance as Glass. The two materials differ in what they can do. Glass2 is better if you need two volumes interacting with each other, such as water in a glass. Glass2 can calculate the relative IOR between those two surfaces, which Glass requires to be done manually with a third mesh and the user calculating the relative IOR by hand. Glass2 can also handle more specific and technical IOR data than the Glass material, such as using the [http://en.wikipedia.org/wiki/Sellmeier_equation Sellmeier] equation, so Glass2 technically can handle light more accurately than Glass.

On the other hand, Glass has got the option for a separate reflection and transmission color (for painted glass) or using a thin film coating.