Blaze Shader (VDB Volume)

New Blaze Shader v/s Old Blaze Shader:-

The New Shader has more details, but a little bit slower to render, as compared to the Old blaze shader.

How to add shader?

After choosing from the dropdown, you can click on "Add Blaze Shader (VDB Volume)", and this will add Blaze shader in the node editor, and currently, this has a total of 14 colors presets, including a custom color output socket.

Understanding Input sockets

Smoke brightness & Smoke contrast:-

> Smoke brightness and contrast inputs actually affect the density attribute, and thus should be used wisely, as these first two inputs are relative to each other, so changing only one slider at its extreme can cause bizarre results. and that's why in the new blaze shader these values are turned off to zero by default.

but if you are still willing to try these values, you should maintain a proper ratio between the values to avoid strange-looking fire or smoke.

> example: In the below Image there is a comparison between the two, In the left Image Smoke brightness, and contrast sliders have a value of 0. whereas, in the right Image the value of Smoke brightness is 1.00 and contrast is 2.00, while all other values are at their default.

Smoke Intensity:-

> Smoke intensity, as its name specifies, controls the amount of smoke, you want, with your fire, and changing this value also affects the look of fire, if the Value of 'smoke intensity' is increased to the extremely high value, the fire will look dull, or in some cases, fire may disappear, so for this, the slider's maximum and minimum values work best, going beyond that will create unrealistic results.

While, if you turn the smoke intensity to 0, the smoke will disappear and your simulation will look smokeless, and that too is unrealistic. All it depends on it is what kind of simulation you are making?

if you are going for nuclear explosions, you will need much more and thus a higher value of smoke density, and if you are on a small bonfire or a burner flame, you will need very less amount of smoke, and thus a lower value like 0.100  will work.

but if you are still willing to try these values, you should maintain a proper ratio between the values to avoid strange-looking fire or smoke.

> example: In the below Image there is a comparison between the two, In the left Image, the Smoke Intensity slider has a value of 2. whereas, in the right Image the value of Smoke intensity is 15.00, while all other values are at their default.

Fire Brightness & Contrast:-

> Fire Brightness & Fire Contrast Sliders are also relative to each other, 

But for this case you are freer in tweaking values compared to Smoke Brightness & contrast. By using Fire Brightness & Contrast, you can make your fire more bright, and glowy. Increasing the fire brightness will also result in a reduction of smoke.

> example: In the below Image there is a comparison between the two, In the left Image, the Fire brightness & Fire contrast slider has a value of 0. whereas in the right Image the value of Fire brightness is 1.00, and Fire Contrast is 2.00, while all other values are at their default.

Fire Intensity:-

> Fire intensity, as its name specifies, controls the amount of Fire, you want, and changing this value also affects the overall look of your simulation, if the value of 'Fire intensity' is increased to the extremely high value, the fire will look brighter and more immense, and the point to be kept in mind while dealing with this is, if you increase the value to very higher numbers, you will start losing detail because of extra brightness.

Fire intensity also indirectly affects, the amount of smoke, if the value of fire intensity is too high, the smoke will begin to reduce.

> example: In the below Image there is a comparison between the two, In the left Image, the Fire Intensity slider has a value of 15000. whereas, in the right Image the value of Fire intensity is 60, while all other values are at their default.

Impotence:-

> Impotence, as its name specifies, controls the power of fire, simply, if you increase the value, the fire will become dull, and lower values will make fire brighter. but going below the minimum limit will make fire unsaturated, or yellowish and then even lower values approaching zero will make it whiter, while the higher values will make it redder. This input has less to do with intensity, and more to do with color and look of fire.

This totally depends upon your personal choice.

>example:-Below is the comparison between the higher Impotence value and a lower Impotence Value. In the left image, the value of Impotence is 0.500, while the value of impotence in the right image is 2.00.

Custom color:-

> Custom color input facilitates choosing the color of your own choice for fire, if the already present presets are not enough for you, and are willing to explore more colors to create custom beautiful or evil-looking fires, for your scene.

>You can also connect the blackbody node to this socket to grab the colors from the temperature values.

>example:-Below is the demo of two different looking colored fire

Smoke color:-

> Smoke color input facilitates choosing the color of your own choice for smoke, if you need a different color smoke, you can do it here.

Most of the times, you won't need it, but whenever required, you can adjust it here.

Burner flame Intensity:-

> As its name specifies burner flame intensity slider can be used for adjusting, the brightness of the flame.

> Currently the default value is 1.00, but this will be changed to 0.030 in version 1.6 as the default value, and minimum and maximum values will also be reworked in the upcoming version.

> For this you can work with the smaller values like 0.015 to 0.075 to get a good looking flame, and also you may need to turn down the smoke intensity from the default value of 15 to 0.050, or 0.100, or even you can turn this down to 0.00, as burner do not have much smoke in its flame.

Detail:-

> As its name specifies is meant to controls the level of detail, Currently this feature is experimental, and that's why it is not working much as expected, so we are working on it to improve it on a higher level.

> but a point to keep on the note is decreasing the detail slider on extreme also reduces fire brightness, so to handle this situation, you can either position the slider in a limited way, or you can increase the value of the fire brightness slider to counter the effect of low brightness of the fire

Lowering the detail slider increases the detail, and increasing this value leads to an increase in fire brightness, and starts losing the detail.

Currently, this slider increases the fire intensity without affecting the amount of smoke

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