BoatAttack/Packages/com.unity.shadergraph/Documentation~/Normal-From-Texture-Node.md

Normal From Texture Node

Description

Converts a height map defined by input Texture into a normal map. UV values and sampler state can be defined by inputs UV and Sampler respectively. If nothing is connected to these ports they will use default values from the inputs. See Port Bindings for more information.

The strength of the created normal map can be defined by inputs Offset and Strength, where Offset defines the maximum distance of a normal detail and Strength acts as a multiplier to the result.

Ports

Name	Direction	Type	Binding	Description
Texture	Input	Texture	None	Height map
UV	Input	Vector 2	UV	Texture coordinates
Sampler	Input	Sampler State	None	Sampler for Texture
Offset	Input	Vector 1	None	Amount to offset samples
Strength	Input	Vector 1	None	Strength multiplier
Out	Output	Vector 3	None	Output value

Generated Code Example

The following example code represents one possible outcome of this node.

void Unity_NormalFromTexture_float(Texture texture, SamplerState Sampler, float2 UV, float Offset, float Strength, out float3 Out)
{
    Offset = pow(Offset, 3) * 0.1;
    float2 offsetU = float2(UV.x + Offset, UV.y);
    float2 offsetV = float2(UV.x, UV.y + Offset);
    float normalSample = Texture.Sample(Sampler, UV);
    float uSample = Texture.Sample(Sampler, offsetU);
    float vSample = Texture.Sample(Sampler, offsetV);
    float3 va = float3(1, 0, (uSample - normalSample) * Strength);
    float3 vb = float3(0, 1, (vSample - normalSample) * Strength);
    Out = normalize(cross(va, vb));
}